diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 46e392b..059be29 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,6 +11,9 @@ concurrency:
 
 jobs:
   build:
+    # CachyOS's plain ISO and its quicktest matrix: only in CachyOS's own repo, not in this fork
+    # (the Steamify ISO is iso-2-gitea-build.yml).
+    if: github.repository == 'CachyOS/CachyOS-Live-ISO'
     runs-on: ubuntu-latest
     container:
       image: archlinux:base-devel
diff --git a/.github/workflows/iso-1-github-tag.yml b/.github/workflows/iso-1-github-tag.yml
new file mode 100644
index 0000000..616dd73
--- /dev/null
+++ b/.github/workflows/iso-1-github-tag.yml
@@ -0,0 +1,69 @@
+# The Steamify ISO's release, step 1 of 2 (GitHub): names it and creates its tag and a release with the notes.
+# The Gitea mirror (git.upriser.nl) gets the tag with its next sync (triggered here when GIT_UPRISER_TOKEN is set),
+# builds the ISO on that tag and attaches it to its own release for it (iso-2-gitea-build.yml). The ISO lives there:
+# GitHub releases take at most 2 GB per file, the ISO is bigger, and a release on the mirror only survives its
+# syncs when its tag comes from here.
+# Name: the Steamify version the ISO gets (its newest release) plus the time (UTC, GitHub's clock when the release starts):
+# master releases v<steamify>-<YYYY.MM.DD>-<HHMM>, feat/steamify a pre-release v<steamify>-dev.<...>.
+name: ISO 1/2 · Tag and release (GitHub)
+
+# Started by a new Steamify release (its bundle.yml, secret ISO_DISPATCH_TOKEN) or by hand (Run workflow,
+# on master for a release, on feat/steamify for a test build); not by every push.
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+env:
+  GITEA_URL: ${{ secrets.GIT_UPRISER_URL }}
+  GITEA_REPO: theupriser/steamify-cachyos-live-iso
+
+jobs:
+  tag:
+    if: github.server_url == 'https://github.com'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Tag and release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          steamify="$(gh release view -R theupriser/steamify-cachyos --json tagName -q .tagName)"
+          steamify="${steamify#v}"
+          stamp="$(date -u +%Y.%m.%d-%H%M)"
+          if [ "${{ github.ref }}" = refs/heads/master ]; then
+            tag="v$steamify-$stamp" pre="" name="CachyOS with Steamify Live ISO $steamify ($stamp UTC)"
+          else
+            tag="v$steamify-dev.$stamp" pre="--prerelease" name="CachyOS with Steamify Live ISO $steamify (test build $stamp UTC)"
+          fi
+          # The ISO's file on the mirror is named after the tag (iso-2-gitea-build.yml, profiledef.sh), so its
+          # download link is known now.
+          file="steamify-cachyos-${tag#v}-x86_64.iso" dl="$GITEA_URL/$GITEA_REPO/releases/download/$tag"
+          # The Steamify section of CHANGELOG.md ("## CachyOS with Steamify Live ISO"), without its heading.
+          section="$(awk '/^## CachyOS with Steamify Live ISO/ {found = 1; next} found && /^#/ {exit} found' CHANGELOG.md)"
+          notes="The ISO is built from \`$(git rev-parse --short HEAD)\` (${{ github.ref_name }}) with Steamify $steamify and published on the mirror (GitHub releases take at most 2 GB per file), about half an hour after this release (the mirror's sync, then the build):
+
+          **Download: [$file]($dl/$file)** ([SHA-256]($dl/$file.sha256), [release page]($GITEA_URL/$GITEA_REPO/releases/tag/$tag))
+
+          Sources: [Steamify](https://github.com/theupriser/steamify-cachyos/tree/v$steamify), this repository at this tag, and the packages' sources at [CachyOS](https://github.com/CachyOS) and [Arch Linux](https://archlinux.org/packages/).
+
+          $section"
+          # An annotated tag: its own date, so the mirror sorts releases on the same commit in order (a
+          # lightweight tag only has its commit's date).
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git tag -a "$tag" -m "$name" "$GITHUB_SHA" && git push origin "refs/tags/$tag"
+          gh release create "$tag" --verify-tag $pre --title "$name" --notes "$notes"
+          echo "Released $tag"
+
+      # Optional: sync the mirror at once instead of at its interval (a Gitea token with repository write
+      # access as the secret GIT_UPRISER_TOKEN).
+      - name: Sync the Gitea mirror
+        env:
+          GIT_UPRISER_TOKEN: ${{ secrets.GIT_UPRISER_TOKEN }}
+        run: |
+          if [ -z "$GIT_UPRISER_TOKEN" ]; then echo "No GIT_UPRISER_TOKEN: the mirror picks the tag up at its next sync."; exit 0; fi
+          curl -fsS --retry 5 --retry-delay 10 --retry-all-errors -X POST -H "Authorization: token $GIT_UPRISER_TOKEN" "$GITEA_URL/api/v1/repos/$GITEA_REPO/mirror-sync" &&
+            echo "Mirror sync started"
diff --git a/.github/workflows/iso-2-gitea-build.yml b/.github/workflows/iso-2-gitea-build.yml
new file mode 100644
index 0000000..edae835
--- /dev/null
+++ b/.github/workflows/iso-2-gitea-build.yml
@@ -0,0 +1,112 @@
+# The Steamify ISO's release, step 2 of 2 (the Gitea mirror, git.upriser.nl, on its own runner): builds the
+# ISO for a release tag that iso-1-github-tag.yml created on GitHub (it comes in with the mirror's sync, and a
+# release on the mirror only survives its syncs when its tag comes from GitHub), then attaches the ISO, its
+# checksums and package list to the mirror's release for that tag. The tag names the Steamify version and
+# the time: v<steamify>-<YYYY.MM.DD>-<HHMM> (master) or v<steamify>-dev.<...> (feat/steamify, a pre-release);
+# the ISO gets exactly that Steamify release, and its label the same moment. GitHub skips it.
+# The runner needs privileged containers (archiso mounts loop devices) and ~20 GB of disk; Gitea's
+# [repository.release] FILE_MAX_SIZE must allow the ISO (default 2 GB).
+name: ISO 2/2 · Build and publish (Gitea)
+
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+concurrency:
+  group: steamify-iso-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  iso:
+    if: github.server_url != 'https://github.com'
+    runs-on: ubuntu-latest
+    container:
+      image: docker.io/cachyos/cachyos:latest
+      options: --privileged
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Tools
+        run: |
+          pacman-key --init && pacman-key --populate
+          # nodejs: the actions below run in this container
+          pacman -Syu --noconfirm --needed archiso mkinitcpio-archiso git squashfs-tools grub sudo nodejs curl jq
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Version and time from the tag
+        run: |
+          tag="${{ github.ref_name }}"
+          [[ "$tag" =~ ^v([0-9]+\.[0-9]+\.[0-9]+)-(dev\.)?([0-9]{4})\.([0-9]{2})\.([0-9]{2})-([0-9]{4})$ ]] ||
+              { echo "::error::$tag is not a Steamify ISO release tag (v<steamify>-[dev.]<YYYY.MM.DD>-<HHMM>)"; exit 1; }
+          m=("${BASH_REMATCH[@]}")
+          {
+            echo "STEAMIFY_VERSION=${m[1]}"
+            # One moment for the ISO's label (profiledef.sh) and the release's name: the tag's (UTC).
+            echo "STEAMIFY_BUILD_STAMP=${m[3]}${m[4]}${m[5]}_${m[6]}"
+            echo "ISO_PRERELEASE=$([ -n "${m[2]}" ] && echo true || echo false)"
+            # The ISO's file name: the tag without its v (profiledef.sh).
+            echo "STEAMIFY_ISO_VERSION=${tag#v}"
+          } >> "$GITHUB_ENV"
+
+      - name: Steamify on the ISO (the version the tag names)
+        run: ./steamify-prepare.sh
+
+      - name: Build
+        run: |
+          ./build-live-modules.sh
+          ./build-calamares-modules.sh
+          ./buildiso.sh -p desktop -w || ./buildiso.sh -p desktop -c -w
+
+      - name: Release name and notes
+        id: rel
+        env:
+          TOKEN: ${{ github.token }}
+        run: |
+          iso="$(ls out/desktop/*.iso | head -n 1)"
+          [ -f "$iso" ] || { echo "::error::no ISO in out/desktop"; exit 1; }
+          tag="${{ github.ref_name }}" b="$STEAMIFY_BUILD_STAMP"
+          stamp="${b:0:4}.${b:4:2}.${b:6:2}-${b:9:4}"
+          if [ "$ISO_PRERELEASE" = true ]; then
+            name="CachyOS with Steamify Live ISO $STEAMIFY_VERSION (test build $stamp UTC)"
+          else
+            name="CachyOS with Steamify Live ISO $STEAMIFY_VERSION ($stamp UTC)"
+          fi
+          # Never overwritten: a release for this tag that already has the ISO is left alone.
+          api="${{ github.server_url }}/api/v1/repos/${{ github.repository }}"
+          if curl -fsS -H "Authorization: token $TOKEN" "$api/releases/tags/$tag" -o /tmp/rel.json &&
+              [ "$(jq '[.assets[] | select(.name | endswith(".iso"))] | length' /tmp/rel.json)" -gt 0 ]; then
+            echo "::warning::$tag already has its ISO and won't be overwritten."
+            echo "publish=false" >> "$GITHUB_OUTPUT"; exit 0
+          fi
+          { echo "publish=true"; echo "name=$name"; } >> "$GITHUB_OUTPUT"
+          section="$(awk '/^## CachyOS with Steamify Live ISO/ {found = 1; next} found && /^#/ {exit} found' CHANGELOG.md)"
+          {
+            echo "Built from \`$(git rev-parse --short HEAD)\` ($tag) with Steamify $STEAMIFY_VERSION."
+            echo
+            echo "SHA-256: \`$(cut -d' ' -f1 "$iso.sha256")\`, label \`STEAMIFY_${STEAMIFY_VERSION//./_}_$b\`"
+            echo
+            echo "Sources: [Steamify](https://github.com/theupriser/steamify-cachyos/tree/v$STEAMIFY_VERSION), this repository at this tag, and the packages' sources at [CachyOS](https://github.com/CachyOS) and [Arch Linux](https://archlinux.org/packages/)."
+            echo
+            echo "$section"
+          } > release-notes.md
+          cat release-notes.md
+
+      - name: Publish ${{ github.ref_name }}
+        if: steps.rel.outputs.publish == 'true'
+        uses: akkuman/gitea-release-action@v1.3.7
+        with:
+          token: ${{ github.token }}
+          tag_name: ${{ github.ref_name }}
+          name: ${{ steps.rel.outputs.name }}
+          body_path: release-notes.md
+          prerelease: ${{ env.ISO_PRERELEASE }}
+          files: |
+            out/desktop/*.iso
+            out/desktop/*.iso.sha256
+            out/desktop/*.iso.sha1
+            out/desktop/*.pkgs.txt
diff --git a/.gitignore b/.gitignore
index 6713072..fae11cb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,9 @@ archiso/airootfs/etc/environment
 archiso/airootfs/etc/pacman.d/cachyos-mirrorlist
 archiso/airootfs/etc/edition-tag
 archiso/airootfs/etc/version-tag
+archiso/airootfs/usr/local/share/steamify/
+archiso/airootfs/usr/lib/libboost_*
+archiso/airootfs/etc/steammachine-iso-build
+archiso/airootfs/usr/lib/modules/
+archiso/airootfs/etc/modules-load.d/steamify-fremont-poweroff.conf
+archiso/airootfs/usr/lib/calamares/modules/packagechooserq/
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..3724971
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,132 @@
+# AGENTS.md
+
+Guidance for AI coding agents working on this repository (the Steam Machine
+live ISO: CachyOS + the Steamify installer step). See `README.md` and
+`TODO.md` for what's built and what's left; this file is operational
+knowledge — how to test/build/debug it without rediscovering the same
+things every session. `TODO.md` should stay a plain task list; lessons and
+gotchas belong here instead.
+
+Full build/test workflow (VM scripts, snapshots, cache setup) lives in the
+`steam-machine-iso` and `cachyos-vm-testing` skills in `steamify-cachyos-dev`
+— load those first. This file is the overflow: things worth knowing that
+don't fit a skill's step-by-step flow.
+
+## Calamares modules
+
+- Verify a module is actually installed (`ls /usr/lib/calamares/modules`)
+  before writing QML/config for it. A `.conf` file existing is not proof —
+  CachyOS's own `cachyos-calamares-next` build explicitly skips
+  `packagechooserq` (`-DSKIP_MODULES=...`).
+- Read a module's *actual* logged global-storage writes (Calamares debug
+  log, `-D6`), not its UI label text, to know what a `mode`/`method` really
+  does.
+- `packagechooser`'s multi-select only works with Shift/Ctrl-click (a plain
+  click replaces the selection) and its UI has no visible checkboxes — not
+  usable as the Steamify page. Use `packagechooserq` (custom QML,
+  qtplugin/legacy) or `netinstall` (checkbox tree) instead.
+- `packagechooserq` is built out of tree against the installed Calamares
+  CMake config (`/usr/lib/cmake/Calamares`) with
+  `-DWITH_QML=ON -DQT_VERSION_SUFFIX=-qt6 -Dqtname=Qt6 -DWITH_QT6=ON`;
+  `find_package(KF6CoreAddons)` must come before `find_package(Calamares)`
+  or the build fails with "KF6::CoreAddons target not found". Its `Config`
+  class (and `prettyStatus()`'s raw `Install option: <ids>` text) is shared
+  with the plain `packagechooser` module — override `prettyStatus()` in
+  `PackageChooserQmlViewStep.cpp` itself (not `Config.cpp`) to change only
+  this module's Summary display without affecting `packagechooser@desktop`
+  etc. elsewhere in the installer.
+- Both `packagechooserq` (QML swap) and `netinstall` (config swap) are
+  testable live in a booted ISO VM with no rebuild: edit
+  `/etc/calamares/modules/*.conf` + `settings.conf`
+  (`steamify-cachyos-dev/share/sq.sh` / `sn.sh`), relaunch
+  `pkexec-wrapper calamares -D6` in a **separate Konsole tab** (it blocks
+  the tab it runs in; typing into that same tab just echoes inertly into
+  its blocked stdin). A C++ module change needs an actual rebuild
+  (out-of-tree, in the build VM) and redeploying the `.so` — no shortcut.
+
+## Shell pitfalls
+
+`local a=/x b="$a/y"` expands every value before assigning any, so `b` is
+`/y`: `calamares-online.sh` wrote the downloaded `steamify.sh` to
+`/steamify.sh` and `items.json` to a nonexistent `/qml/`, silently (stderr
+went to `/dev/null`), so the Steamify page always ran on build-time rows and
+the Summary had no labels. Declare a variable in its own `local` before
+using it, and send a step's errors to the launcher's log, not `/dev/null`.
+
+## ISO permissions
+
+`steamify-prepare.sh` fetches `steamify.sh` with `curl -o`, which doesn't
+carry the executable bit, and `archiso/profiledef.sh`'s `file_permissions`
+map is the only other place permissions get fixed up on the ISO — any path
+not listed there stays at whatever `curl`/`cp` gave it. `calamares-online.sh`
+execs `steamify.sh` directly (not via `bash`) to regenerate `Items.qml`/
+`items.json` at boot; without +x that failed *silently* (its stderr is
+redirected to `/dev/null`), so the page kept working off build-time
+fallbacks with no visible error. When something the ISO downloads or copies
+at build time needs to run directly (not `bash script.sh`), add it to
+`file_permissions` — don't assume the source already had the right mode.
+
+## Driving a live/installer session via QMP
+
+- Don't screenshot-poll for VM readiness. Pass `VM_SERIAL=<file>` to
+  `run.sh`/`vmisoboot.sh` (logs `console=ttyS0` to a plain text file) and
+  grep that instead — near-zero tokens vs. repeated screenshot + image
+  analysis. Only screenshot at real decision points (to show the user, or
+  to check a layout), not as a polling mechanism.
+- The live session's keyboard layout keeps drifting to Dutch (e.g. after
+  Calamares' Welcome page's keyboard preview, or after opening System
+  Settings), which silently breaks `qmptype.py`'s US-layout character map
+  (`/` → `-`, `&`/`>` fail outright) with no error for the common
+  substitutions. Check with a no-symbols probe (`echo test123`) after any
+  language/keyboard step. Typing `setxkbmap us` via QMP does fix it.
+- `qmptype.py` types `&`, `>`, `<`, `?`, `{`, `}` since 2026-09-28 (before,
+  `>` raised "no key for" and left half a command in the prompt: send
+  Ctrl+C before retyping). Its map is US-layout, see above.
+- Send QMP keystrokes one command at a time with a beat (~1-2s) in between.
+  Firing several `qmptype.py` calls back-to-back can interleave with the
+  guest's own prompt redraw and garble the input (seen as commands merging
+  or a stray leading character).
+- Calamares page Next/Back buttons move vertically as page content
+  grows/shrinks: re-screenshot and re-locate the button after every page
+  change, don't reuse a fixed y-coordinate.
+- A second `pkexec-wrapper calamares -D6` while an earlier failed
+  instance's window is still open just prints "Calamares is already
+  running.": close that window first (Cancel/Afbreken, then confirm the
+  "really cancel?" dialog).
+
+## Build VM SSH flakiness
+
+The build VM's guest sshd applies OpenSSH's `PerSourcePenalties`: repeated
+quick reconnect attempts within its window make `ssh`/`scp` fail instantly
+with "Connection closed" (verbose: "Not allowed at this time"), and further
+quick retries seem to extend the penalty rather than reset it. Don't
+retry-loop through it — that makes it worse. Either back off for a good
+while (minutes, not seconds) with zero attempts in between, or just restart
+the VM, which clears its in-memory penalty state immediately and is
+usually faster than waiting it out.
+
+Large `scp` transfers (e.g. the ~3.2GB built ISO) over this same flaky link
+can report "Connection closed" while actually still having copied fully —
+check the destination file's size/timestamp before assuming a real
+failure, and retry the copy (it's idempotent) rather than the whole build.
+
+## Releases (GitHub tag, ISO built and attached on the Gitea mirror)
+
+Full write-up, with every trap: `steamify-iso-release` in steamify-cachyos-dev. What matters here:
+
+- `.github/workflows/iso-1-github-tag.yml` (GitHub, `workflow_dispatch` only: by hand, or started by a new Steamify
+  release, whose `bundle.yml` needs the secret `ISO_DISPATCH_TOKEN`) names the release: the Steamify version plus
+  GitHub's UTC time, `vX.Y.Z-[dev.]YYYY.MM.DD-HHMM`, an **annotated** tag and a release with notes and the direct
+  download link. `feat/steamify` makes a `dev.` pre-release, `master` a real one.
+- `.github/workflows/iso-2-gitea-build.yml` (Gitea, `on: push: tags: v*`, skipped on GitHub) builds the ISO for that
+  tag and attaches it to the mirror's release. The tag decides everything: Steamify version (`steamify-prepare.sh`
+  takes `STEAMIFY_VERSION`), file name (`STEAMIFY_ISO_VERSION` -> `iso_version` in `profiledef.sh`), label
+  (`STEAMIFY_BUILD_STAMP`), boot menu and `/etc/steammachine-iso-build`. The build reads no clock; without a
+  tag everything says `local`.
+- `util-iso.sh` runs `sudo mkarchiso`: sudo drops the environment, so `--preserve-env=STEAMIFY_ISO_VERSION,
+  STEAMIFY_BUILD_STAMP` is required (without it the ISO comes out `-local-`).
+- Never create a release on the mirror by hand or from a Gitea-only tag: the pull mirror's next sync deletes tags
+  GitHub doesn't have, and the release with them. GitHub releases can't hold the ISO (2 GB per file).
+- Gitea needs `[repository.release] FILE_MAX_SIZE` above the ISO (413 otherwise) and the runner
+  `container: privileged: true` (archiso mounts `/proc`); the workflow's `--privileged` option is ignored.
+- CachyOS's own `Desktop ISO` workflow (`build.yml`) only runs in `CachyOS/CachyOS-Live-ISO`.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab16833..378af9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,46 @@
   * Correctly handle VM environments
   * Correctly quote pacman arguments
 
+## CachyOS with Steamify Live ISO
+CachyOS 26.08 with Steamify built in: install CachyOS and turn the PC into a Steam Machine in one go.
+Its version is the Steamify version on it plus the build date and time (UTC, when the release starts on GitHub; a release on `master` is `v<Steamify version>-<date>-<HHMM>`, e.g. `v2.9.3-2026.09.29-2015`). A new Steamify release starts one (a test build for now); by hand: Run workflow on "ISO 1/2 · Tag and release (GitHub)".
+Releases: GitHub creates the tag and a release with the notes; the ISO itself (over GitHub's 2 GB limit) is built on the Gitea mirror and attached to its release for that tag (git.upriser.nl).
+
+**Features:**
+
+* **ISO:** named after its release tag (`steamify-cachyos-2.9.3-2026.09.29-2030-x86_64.iso`; built by hand, without a tag: `local`), labelled after the Steamify version on it and the build time (`STEAMIFY_2_9_1_20260929_1432`, was CachyOS's `COS_<year><month>`); CachyOS Hello installs it like CachyOS's own
+  release (the ISO's own release, its tag without the v, is in `/etc/steammachine-iso-build` and the boot menu)
+* **Installer (CachyOS - Steamify Installer):**
+  * A Steamify page after the packages page: which Steam Machine parts to set up (rows from
+    `steamify.sh --defaults --list`, the newest Steamify fetched before Calamares starts) and where
+    the PC starts (gaming mode or the desktop)
+  * The Summary lists every chosen item and where the PC starts
+  * The new user's Steam Machine setup runs during the install (`steamify-install`, a Calamares step
+    before cleanup): the first boot is already a Steam Machine
+  * Only what Steamify supports is offered: KDE Plasma, and the boot loaders Limine, systemd-boot and
+    GRUB (not rEFInd)
+* **Live session:** keeps CachyOS's own name; the power-off fix is built for the ISO's kernels, and
+  the login has the Vapor look
+
+**Fixes:**
+
+* **systemd-boot:** the installed system gets its "Linux Boot Manager" EFI boot entry, first in the
+  boot order. cachyos-installer runs `bootctl install` in a chroot, where bootctl leaves the EFI
+  variables alone, so the entry was missing: the PC could only boot through the disk's fallback path
+  (`\EFI\BOOT\BOOTX64.EFI`). Most PCs find it early and boot normally, but firmware that tries the
+  network first waits minutes on every boot (QEMU/OVMF: PXE, HTTP boot and the EFI shell come first),
+  and anything else that writes the fallback file (another OS) takes the boot over.
+  `steamify-install` now registers it with `efibootmgr` from the live system, with the ESP's real
+  disk and partition (bootctl in the chroot writes an entry without a partition, which the firmware
+  can't load); the output is in `/var/log/steamify-bootentry.log`
+* **Installer:** Steamify's install-time logs (`/var/log/steamify-install.log`,
+  `steamify-bootentry.log`) are readable after the first boot: `/var/log` is its own btrfs subvolume
+  (`@log`) that wasn't mounted yet when Steamify ran, so they ended up hidden under it
+* **Installer:** Steamify's setup never asks for a password (its sudo rule is read after CachyOS's
+  `%wheel` rule); Calamares starts with the Boost version it was linked against
+* **Build:** finishes cleanly as root and reports no error after a successful build; the Steamify page's
+  Calamares module is built with the ISO and left out when Calamares' version differs
+
 # 26.07
 **Features:**
 
diff --git a/README.md b/README.md
index 0adb4f3..55e3f2e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,63 @@
+# Steamify CachyOS ISO for the Steam Machine
+
+A CachyOS desktop ISO for the Valve Steam Machine with
+[Steamify](https://github.com/theupriser/steamify-cachyos) built in:
+- The live session has the Steam Machine drivers (power-off fix).
+- The installer ("CachyOS with Steamify Installer") has a Steamify page where
+  you pick the options and whether the PC starts in gaming mode or on the
+  desktop. Steamify is applied during the install.
+
+> **Choose KDE Plasma in the installer.** Steamify only works with KDE Plasma
+> (the default). With another desktop (GNOME, Hyprland, Cosmic, ...) Steamify
+> is not supported.
+
+## Building the ISO yourself
+
+You need about 20 GB of free space, and a Linux PC with
+[podman](https://podman.io) (or Docker: replace `podman` with `docker`). The
+build runs in CachyOS's own container, so the PC doesn't have to run CachyOS.
+
+```bash
+git clone -b feat/steamify https://github.com/theupriser/steamify-cachyos-live-iso
+cd steamify-cachyos-live-iso
+
+# Put Steamify on the ISO: the newest release. To use your own checkout,
+# pass its path: ./steamify-prepare.sh ~/steamify-cachyos
+./steamify-prepare.sh
+
+mkdir -p ~/iso-cache    # downloaded packages, kept for the next build
+sudo podman run --rm -t --privileged --network=host \
+  --pids-limit=-1 --ulimit nofile=65536:65536 \
+  -v ~/iso-cache:/var/cache/pacman/pkg -v "$PWD":/iso -w /iso \
+  docker.io/cachyos/cachyos:latest bash -c '
+    pacman-key --init && pacman-key --populate &&
+    pacman -Syu --noconfirm --needed archiso mkinitcpio-archiso git squashfs-tools grub sudo &&
+    ./build-live-modules.sh && ./build-calamares-modules.sh &&
+    ./buildiso.sh -p desktop -w'
+```
+
+The ISO is written to `out/desktop/steamify-cachyos-<date>.iso`. Write it to
+a USB stick (for example with `dd` or Fedora Media Writer) and boot the Steam
+Machine from it.
+
+**Why these steps:**
+- `build-live-modules.sh` builds the power-off fix for the ISO's kernels.
+  Without it, the Steam Machine starts up again right after shutting down.
+- `build-calamares-modules.sh` builds the installer module that shows the
+  Steamify page. CachyOS's installer package leaves it out.
+- `--pids-limit=-1` and `--ulimit nofile=...` are needed because pacman runs
+  out of processes or open files in the container otherwise (GPGME errors).
+- `--network=host` gives the container DNS.
+- `-w` removes the build folder afterwards. Before building again, run
+  `sudo rm -rf build out`.
+
+To build on CachyOS directly, without a container, install the same packages
+with pacman and run the three scripts with `sudo`.
+
+---
+
+The notes below are from CachyOS's original repository.
+
 These are the basic needed files and folders to build CachyOS system.
 
 ### buildiso
diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..d142d57
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,89 @@
+# To do (Steam Machine edition)
+
+## Open
+
+1. **Steamify installer page** (2026-09-28, working end to end; see
+   `AGENTS.md` for the module/build/testing details and gotchas behind
+   this). `packagechooserq` (custom QML) is built with each ISO by
+   `build-calamares-modules.sh` into `archiso/airootfs/usr/lib/calamares/modules/packagechooserq/`.
+   `netinstall` (checkbox tree) stays as a manually-swappable fallback
+   (`steamify-cachyos-dev/share/sn.sh` + `nisteamify.conf`) for when the
+   module can't load, but isn't wired into `calamares-online.sh`
+   automatically yet.
+   - **Still open**:
+     - A Python job (e.g. `steamifychoice`, before `packages@online`) to
+       normalize either page's choice (packagechooserq's
+       `packagechooser_steamifypage` GS key, or netinstall's
+       packageOperations markers) into one `steamifyChoice` GS key, so
+       `shellprocess_steamify.conf` doesn't need to know which page ran.
+
+2. **Names**: only the installer says Steamify ("CachyOS with Steamify
+   Installer", productName set by calamares-online.sh); the live session,
+   Hello and About this System keep CachyOS's own names (legal clarity). The
+   ISO file stays `steamify-cachyos-<date>.iso`.
+3. **Check the names** after the next build: installer title, Hello and
+   About this System say CachyOS.
+4. ~~Steamify PR for `feat/defaults-options`~~ — done: 2.7.0 (`--options`,
+   `--boot`, `steamify.sh --boot` standalone) and 2.8.0
+   (`--defaults --list`, what the Steamify page's rows come from) are both
+   released. **The ISO builder is up to date with this**: no checkout
+   argument needed, `steamify-prepare.sh` (no args) and `calamares-online.sh`
+   at boot both just fetch the newest release, so the ISO always has 2.8.0+
+   without a rebuild for a Steamify-side change alone. Only pass
+   `steamify-prepare.sh <checkout>` / `vmisobuild.sh --steamify <path>` when
+   testing an *unreleased* Steamify change.
+5. **Build in the test VM** instead of on the Steam Machine
+   (steam-machine-iso skill), and install the result unattended with
+   `scripts/vminstall.sh --iso` (vm-install skill; the Calamares Steamify
+   step then needs `steamify-install` run from the live script).
+6. **Test on the real Steam Machine** from a USB stick (gamescope, LEDs, CEC,
+   power-off) before calling the ISO usable.
+
+## Done
+
+- **Full ISO install with the Steamify page** (2026-09-28, ISO VM,
+  `--fremont`, Start in: desktop): Summary listed the choices, the
+  install step ran Steamify 2.8.0 with every item OK, `--boot desktop`
+  applied, `exit: 0`; the installed system boots into the desktop.
+- **Steamify Summary** (2026-09-28, ISO VM): an unordered list of the chosen
+  items' names plus "Starts in gaming mode/the desktop"
+  (`patches/packagechooserq-steamify-summary.patch`), with `items.json`
+  written by the launcher (its `$sdir` bug fixed, `0cc7367`).
+- **packagechooserq built with the ISO** (2026-09-28):
+  `build-calamares-modules.sh` builds it in the build container/VM from
+  CachyOS's Calamares source against the current `cachyos-calamares-next`
+  (no prebuilt `.so` in git), with `built-for`; `calamares-online.sh` leaves
+  the Steamify page out when the Calamares it runs differs (the step then
+  installs everything on) instead of risking "Initialization Failed".
+- **Steamify 2.6.0** released (`--defaults`, install-time mode).
+- **Live session** (VM, `--fremont`): Vapor look and layout (Steam Deck
+  wallpaper) at the live login; the power-off module is built for both ISO
+  kernels and loaded at boot, in the VM it returns "No such device" (no
+  AMDI0030 GPIO controller), as designed. Whether it keeps the real Steam
+  Machine off is part of the hardware test.
+- **Regression test 2.6.0 on an existing desktop install** (test VM from
+  ssh-ready, `--fremont`): full first run, re-apply, notifications/CEC/theme
+  off and on again. No errors; user units enabled and running, theme applied
+  and restored live, no first-login autostart with a session.
+- **ISO name**: `steamify-cachyos-<date>-x86_64.iso` (`iso_name` in
+  `archiso/profiledef.sh`); the volume label stays `COS_<yyyymm>`.
+- **VM install from the ISO (2026-09-27, `f42859a`):** a VM install from the ISO (Hello's
+  Install, no manual fixes) ran Steamify's step: every component OK,
+  `exit: 0`, SDDM autologin into gamescope. First desktop login (session switched to plasma in the VM) passed too:
+  Vapor layout, the app opened with everything on. The first-login script
+  runs the newest *release*, so it only works once 2.6.0 is released (in the
+  test it was pointed at the bundle).
+  The VM's text
+  console doesn't show (virgl): read the installed disk with
+  `qemu-nbd -r` + `mount -o ro,rescue=nologreplay,subvol=@` (logs in `@log`).
+
+## Later
+
+- **Branding**: only the installer carries Steamify's name; check with the
+  CachyOS team whether that and the ISO file name are fine with them.
+- **Release**: a CI job that builds the ISO (privileged container, flags from
+  the steam-machine-iso skill) and hosts it (>2 GB, not a GitHub release asset).
+- **Drop the Boost 1.91 workaround** in `steamify-prepare.sh` once
+  `cachyos-calamares-next` is rebuilt against the repos' Boost.
+
+Build and test details: the `steam-machine-iso` skill in steamify-cachyos-dev.
diff --git a/archiso/airootfs/etc/calamares/modules/packagechooserq_steamifypage.conf b/archiso/airootfs/etc/calamares/modules/packagechooserq_steamifypage.conf
new file mode 100644
index 0000000..b699cb9
--- /dev/null
+++ b/archiso/airootfs/etc/calamares/modules/packagechooserq_steamifypage.conf
@@ -0,0 +1,10 @@
+# Steamify: its page (the app's switches, /usr/local/share/steamify-installer/
+# SteamifyPage.qml). Legacy method: the page's choice (the ids that are on,
+# plus "boot" for Boot into Desktop) goes to global storage as
+# packagechooser_steamifypage, for shellprocess_steamify.conf.
+---
+method: legacy
+qmlFilename: /usr/local/share/steamify-installer/SteamifyPage.qml
+labels:
+    step: "Steamify"
+packageChoice: gaming,theme,glyphs,single,launcher,notify,vram,cec,machine,poweroff
diff --git a/archiso/airootfs/etc/calamares/modules/shellprocess_steamify.conf b/archiso/airootfs/etc/calamares/modules/shellprocess_steamify.conf
new file mode 100644
index 0000000..24dfd01
--- /dev/null
+++ b/archiso/airootfs/etc/calamares/modules/shellprocess_steamify.conf
@@ -0,0 +1,10 @@
+# Steamify: the Steam Machine setup for the new user, before the first boot.
+---
+
+dontChroot: true
+timeout: 3600
+script:
+    - "-/usr/local/bin/steamify-install ${ROOT} ${USER} \"${gs[packagechooser_steamifypage]}\""
+
+i18n:
+    name: "Setting up the Steam Machine (Steamify)"
diff --git a/archiso/airootfs/etc/xdg/autostart/steamify-live-theme.desktop b/archiso/airootfs/etc/xdg/autostart/steamify-live-theme.desktop
new file mode 100644
index 0000000..0dec1d2
--- /dev/null
+++ b/archiso/airootfs/etc/xdg/autostart/steamify-live-theme.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Application
+Name=Steamify live theme
+Exec=/usr/local/bin/steamify-live-theme
+OnlyShowIn=KDE;
+X-KDE-autostart-phase=2
+NoDisplay=true
diff --git a/archiso/airootfs/usr/local/bin/calamares-online.sh b/archiso/airootfs/usr/local/bin/calamares-online.sh
index b587323..6709e37 100755
--- a/archiso/airootfs/usr/local/bin/calamares-online.sh
+++ b/archiso/airootfs/usr/local/bin/calamares-online.sh
@@ -33,6 +33,24 @@ main() {
     echo "USING ISO VERSION: ${ISO_VERSION}"
 
     sudo pacman -Sy --noconfirm cachyos-calamares-next
+    # The installer's window title ("%1 Installer") and welcome text use the
+    # branding's productName; the reinstall above restored CachyOS's.
+    sudo sed -i 's/^\(    productName: *\)CachyOS$/\1CachyOS with Steamify/' \
+        /usr/share/calamares/branding/cachyos/branding.desc
+    # Only what Steamify supports, like CachyOS's handheld edition does:
+    # KDE Plasma as the desktop, and the boot loaders Steamify knows how to
+    # update (Limine, systemd-boot, GRUB; not rEFInd). Drops every other
+    # `    - id:` item block; `default:` (KDE-Desktop, limine) stays valid.
+    local keep_items='/^    - id: / { id = $3; gsub(/"/, "", id); skip = id == "" || index(" " keep " ", " " id " ") == 0 }
+/^[^ ]/ { skip = 0 }
+!skip'
+    local chooser keep
+    for chooser in "desktop:KDE-Desktop" "bootloader:limine systemd-boot grub"; do
+        keep="${chooser#*:}"
+        chooser="/etc/calamares/modules/packagechooser_${chooser%%:*}.conf"
+        awk -v keep="$keep" "$keep_items" "$chooser" | sudo tee "$chooser.new" > /dev/null &&
+            sudo mv "$chooser.new" "$chooser"
+    done
 
     # Get Hardware Informations
     inxi -F > "$log"
@@ -44,7 +62,64 @@ main() {
 ########## System: $SYSTEM
 EOF
 
+    # Steamify: try the newest release before Calamares starts, so the page
+    # and the install step both show/use it; keep the ISO's copy (from
+    # steamify-prepare.sh) on any failure (no network, GitHub unreachable).
+    # Separate statements: `local` expands all its values before assigning
+    # any, so "$sdir" would still be empty in the same one.
+    local sdir=/usr/local/share/steamify
+    local sbin="$sdir/steamify.sh" sqml="$sdir/qml"
+    local tmp; tmp="$(mktemp)"
+    if curl -fsSL --max-time 20 https://github.com/theupriser/steamify-cachyos/releases/latest/download/steamify.sh -o "$tmp" &&
+        grep -q -- '--defaults' "$tmp"; then
+        sudo install -Dm755 "$tmp" "$sbin"
+    fi
+    rm -f "$tmp"
+    tmp="$(mktemp -d)"
+    if curl -fsSL --max-time 20 https://github.com/theupriser/steamify-cachyos/releases/latest/download/steamify-app.tar.gz |
+        tar -xz -C "$tmp" --strip-components=2 ui/qml/Theme.qml ui/qml/Texts.qml 2>/dev/null; then
+        sudo cp "$tmp/Theme.qml" "$tmp/Texts.qml" "$sqml/"
+    fi
+    rm -rf "$tmp"
+    # The page's rows, from whichever steamify.sh ended up on the ISO
+    # (regenerated even when the download failed: the fallback Items.qml
+    # doesn't know this machine, e.g. no VRAM region or no Steam account yet).
+    # JSON is valid JS array-literal syntax, so the output goes straight into
+    # the singleton as-is (--list guarantees one line of only its own JSON
+    # punctuation and text fields Steamify itself writes: nothing here can
+    # break out of the property).
+    tmp="$(mktemp)"
+    if "$sbin" --defaults --list > "$tmp" 2>> "$log" && [[ -s "$tmp" ]]; then
+        { printf 'pragma Singleton\nimport QtQuick\n\nQtObject {\n    readonly property var rows: '
+          cat "$tmp"
+          printf '\n}\n'
+        } | sudo tee "$sqml/Items.qml" > /dev/null
+        # Same rows, plain JSON: packagechooserq's prettyStatus() override
+        # reads this to show the Summary step's choice as labels, not ids.
+        sudo cp "$tmp" "$sqml/items.json"
+    fi
+    rm -f "$tmp"
+
     sudo cp "/usr/share/calamares/settings_${mode}.conf" /etc/calamares/settings.conf
+    # Steamify: its page (packagechooserq@steamifypage, right after the
+    # packages page) and its step (modules/shellprocess_steamify.conf) before
+    # the installer cleans up after itself.
+    # The page's module is built for one cachyos-calamares-next
+    # (build-calamares-modules.sh); the pacman -Sy above may have brought
+    # another, which it might not load in ("Initialization Failed" blocks the
+    # installer). Then leave the page out: the step installs the page's
+    # default, everything on.
+    local built installed
+    built="$(cat /usr/lib/calamares/modules/packagechooserq/built-for 2>/dev/null)"
+    installed="$(pacman -Q cachyos-calamares-next | cut -d' ' -f2)"
+    local page=(-e 's/^  - netinstall$/&\n  - packagechooserq@steamifypage/')
+    if [[ -z "$built" || "$built" != "$installed" ]]; then
+        echo "Steamify page left out: built for cachyos-calamares-next ${built:-?}, running $installed." >> "$log"
+        page=()
+    fi
+    sudo sed -i -e 's/^- id:       cleanup_calamares$/- id:       steamifypage\n  module:   packagechooserq\n  config:   packagechooserq_steamifypage.conf\n\n- id:       steamify\n  module:   shellprocess\n  config:   shellprocess_steamify.conf\n\n&/' \
+        "${page[@]}" \
+        -e 's/^  - shellprocess@cleanup_calamares$/  - shellprocess@steamify\n&/' /etc/calamares/settings.conf
     exec pkexec-wrapper calamares -D6 >> $log
 }
 
diff --git a/archiso/airootfs/usr/local/bin/steamify-install b/archiso/airootfs/usr/local/bin/steamify-install
new file mode 100755
index 0000000..b0bc080
--- /dev/null
+++ b/archiso/airootfs/usr/local/bin/steamify-install
@@ -0,0 +1,62 @@
+#!/bin/bash
+# steamify-install <target root> <user> <choice>: runs Steamify's setup for
+# the new user inside the installed system (Calamares, after the users and
+# services steps), as chosen on the installer's Steamify page: <choice> is the
+# ids that are on, comma-separated, plus "boot" for Boot into Desktop, or
+# "none" (packagechooser_steamifypage). Steamify refuses root and asks sudo
+# per command, so the
+# user gets a NOPASSWD rule for this run only, named to be read last: sudo
+# takes the last matching rule, and a later %wheel rule would ask again. Never fails the install: a
+# problem leaves the log and Steamify can be run again from the desktop.
+root="$1" user="$2" choice="${3:-}"
+# Not filled in by Calamares (empty, or the literal ${gs[...]}): the page's
+# default, everything on.
+[[ -z "$choice" || "$choice" == *'${'* ]] && choice=gaming,theme,glyphs,single,launcher,notify,vram,cec,machine,poweroff
+boot=gamescope options=""
+for id in ${choice//,/ }; do
+    case "$id" in
+        boot) boot=desktop ;;
+        none) ;;
+        *) options+="${options:+,}$id" ;;
+    esac
+done
+# /var/log is its own btrfs subvolume (@log) that the installer doesn't mount at $root/var/log: what is
+# written there now (these logs, Steamify's) would end up hidden under the mount after boot. Mount it
+# from the new system's fstab and leave it mounted: the caller reads the log afterwards, and unmounts
+# all of $root at the end anyway (Calamares' umount step, the test's poweroff).
+if [[ -n "$root" && -d "$root/var/log" ]] && ! mountpoint -q "$root/var/log"; then
+    read -r dev _ _ opts _ < <(awk '$2 == "/var/log" && $1 !~ /^#/' "$root/etc/fstab" 2>/dev/null)
+    [[ -n "${dev:-}" ]] && mount -o "$opts" "$dev" "$root/var/log" 2>/dev/null
+fi
+# systemd-boot: cachyos-installer runs `bootctl install` in a chroot, and bootctl leaves the EFI
+# variables alone there: no "Linux Boot Manager" boot entry, so the firmware tries the network and
+# its other entries first and finds the disk's fallback path last (or never). bootctl can't be made
+# to do it from the chroot either (it writes the entry without the partition: HD(0,GPT,0000...)).
+# So register it from the live system, with the ESP's real disk and partition; efibootmgr puts it first.
+if [[ -n "$root" && -f "$root/boot/EFI/systemd/systemd-bootx64.efi" && -d /sys/firmware/efi/efivars ]]; then
+    {
+        esp="$(findmnt -no SOURCE "$root/boot")"
+        disk="/dev/$(lsblk -no PKNAME "$esp" | head -n 1)"
+        part="$(cat "/sys/class/block/${esp##*/}/partition")"
+        echo "ESP: $esp (disk $disk, partition $part)"
+        for n in $(efibootmgr | sed -n 's/^Boot\([0-9A-Fa-f]\{4\}\)\*\{0,1\} \(Fallback \)\{0,1\}Linux Boot Manager.*/\1/p'); do
+            efibootmgr -q -b "$n" -B
+        done
+        efibootmgr --create --disk "$disk" --part "$part" --label "Linux Boot Manager" --loader '\EFI\systemd\systemd-bootx64.efi'
+    } > "$root/var/log/steamify-bootentry.log" 2>&1
+fi
+log="$root/var/log/steamify-install.log"
+rule="$root/etc/sudoers.d/zz-steamify-install"
+[[ -d "$root" && -n "$user" ]] || exit 0
+# Everything switched off on the page: nothing to set up.
+[[ -n "$options" ]] || { echo "Nothing chosen on the Steamify page." > "$log"; exit 0; }
+
+install -Dm755 /usr/local/share/steamify/steamify.sh "$root/var/tmp/steamify.sh"
+printf '%s ALL=(ALL) NOPASSWD: ALL\n' "$user" > "$rule"
+chmod 440 "$rule"
+arch-chroot "$root" runuser -u "$user" -- env -i HOME="/home/$user" USER="$user" LOGNAME="$user" \
+    PATH=/usr/local/bin:/usr/bin TERM=dumb LANG=C.UTF-8 \
+    bash -c 'cd ~ && bash /var/tmp/steamify.sh --defaults --options "$0" --boot "$1" < /dev/null' "$options" "$boot" > "$log" 2>&1
+echo "exit: $?" >> "$log"
+rm -f "$rule" "$root/var/tmp/steamify.sh"
+exit 0
diff --git a/archiso/airootfs/usr/local/bin/steamify-live-theme b/archiso/airootfs/usr/local/bin/steamify-live-theme
new file mode 100755
index 0000000..64b3095
--- /dev/null
+++ b/archiso/airootfs/usr/local/bin/steamify-live-theme
@@ -0,0 +1,7 @@
+#!/bin/bash
+# The live session in the Vapor look, with its SteamOS desktop layout.
+# CachyOS's own layout comes from /etc/skel, which the live user gets before
+# this runs; lookandfeeltool needs plasmashell up to replace it.
+for _ in $(seq 30); do pgrep -u "$USER" -x plasmashell >/dev/null && break; sleep 1; done
+sleep 2
+lookandfeeltool -a com.valve.vapor.desktop --resetLayout
diff --git a/archiso/airootfs/usr/local/share/steamify-installer/Items.qml b/archiso/airootfs/usr/local/share/steamify-installer/Items.qml
new file mode 100644
index 0000000..582574e
--- /dev/null
+++ b/archiso/airootfs/usr/local/share/steamify-installer/Items.qml
@@ -0,0 +1,20 @@
+// The Steamify page's rows when `steamify.sh --defaults --list` can't be run
+// (see calamares-online.sh, which writes the real list over this copy in
+// /usr/local/share/steamify/qml at the start of the installer).
+pragma Singleton
+import QtQuick
+
+QtObject {
+    readonly property var rows: [
+        { id: "gaming", label: "SteamOS conversion", hint: "boot into gaming mode, Steam on the desktop", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "boot", label: "Boot into", hint: "", kind: "choice", parent: "gaming", on: false, selectable: true },
+        { id: "theme", label: "Install SteamOS theme", hint: "Vapor look (cachyos-vapor)", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "glyphs", label: "Install Steam Deck/Machine icons", hint: "Deck button icons in gaming mode", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "single", label: "Single user mode", hint: "no password, lock screen or log out (SDDM)", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "launcher", label: "Steamify shortcut", hint: "the app on the desktop, Steamify Terminal in the launcher", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "notify", label: "Update notifications", hint: "a notification when there's a new Steamify", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "cec", label: "HDMI-CEC", hint: "use Steam with the TV remote, TV on/off with the PC", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "machine", label: "Steam Machine support", hint: "LED bar driver, hardware settings in Steam", kind: "toggle", parent: "", on: true, selectable: true },
+        { id: "poweroff", label: "Power-off fix", hint: "the Steam Machine stays off after shutting down", kind: "toggle", parent: "machine", on: true, selectable: true }
+    ]
+}
diff --git a/archiso/airootfs/usr/local/share/steamify-installer/SteamifyPage.qml b/archiso/airootfs/usr/local/share/steamify-installer/SteamifyPage.qml
new file mode 100644
index 0000000..34874db
--- /dev/null
+++ b/archiso/airootfs/usr/local/share/steamify-installer/SteamifyPage.qml
@@ -0,0 +1,200 @@
+// Steamify's page in Calamares (packagechooserq@steamifypage, method legacy),
+// styled like the rest of CachyOS's installer: its palette, standard
+// controls, CachyOS's turquoise for the selected row. Left the options,
+// right what the selected (or hovered) one does.
+// The rows come from Steamify itself: calamares-online.sh writes
+// ../steamify/qml/Items.qml from `steamify.sh --defaults --list` (the newest
+// Steamify, else the ISO's), so new options show up without a new ISO; the
+// explanations are the app's (Texts.qml, same folder).
+// The choice goes to Calamares' global storage as packagechooser_steamifypage:
+// the ids that are on, comma-separated, plus "boot" for Boot into Desktop
+// ("none" when nothing is on); steamify-install passes it to
+// `steamify.sh --defaults --options ... --boot ...`.
+import io.calamares.core 1.0
+import io.calamares.ui 1.0
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import "../steamify/qml"
+
+Item {
+    id: page
+    width: parent.width
+    height: parent.height
+
+    SystemPalette { id: pal; colorGroup: SystemPalette.Active }
+    readonly property color accent: "#00CED1"
+
+    Rectangle { anchors.fill: parent; color: pal.window }
+
+    // Only what can be set up here (Steamify leaves out the rest).
+    readonly property var rows: Items.rows.filter(function (r) { return r.selectable; })
+    property var want: ({})
+    property string boot: "gamescope"
+    property int sel: 0
+
+    function label(r) { return (Texts.items[r.id] || {}).label || r.label; }
+    function hint(r) { return (Texts.items[r.id] || {}).hint || r.hint; }
+    function shown(r) { return !r.parent || !!want[r.parent]; }
+
+    // Steamify's own rules: a sub-option needs its parent (turning a parent
+    // off turns its sub-options off); single user mode needs the conversion.
+    function toggle(id) {
+        var w = Object.assign({}, want);
+        w[id] = !w[id];
+        for (var i = 0; i < rows.length; i++) {
+            var r = rows[i];
+            if (w[id] && r.id === id && r.parent) w[r.parent] = true;
+            if (!w[id] && r.parent === id && r.kind === "toggle") w[r.id] = false;
+            if (w[id] && r.parent === id && r.kind === "toggle") w[r.id] = true;   // opt-out sub-options
+        }
+        if (id === "single" && w.single) w.gaming = true;
+        if (id === "gaming" && !w.gaming) { w.single = false; boot = "gamescope"; }
+        want = w;
+    }
+
+    function choice() {
+        var on = [];
+        for (var i = 0; i < rows.length; i++)
+            if (rows[i].kind === "toggle" && want[rows[i].id]) on.push(rows[i].id);
+        if (want.gaming && boot === "desktop") on.push("boot");
+        // ", " (not ","): Calamares' packagechooser Summary step shows this
+        // value raw ("Install option: <value>"); steamify-install still
+        // parses it fine (${choice//,/ } + bash word-splitting collapses
+        // the extra space).
+        return on.length ? on.join(", ") : "none";
+    }
+    onWantChanged: config.packageChoice = choice()
+    onBootChanged: config.packageChoice = choice()
+    Component.onCompleted: {
+        // Preselected like Steamify's first run.
+        var w = {};
+        for (var i = 0; i < rows.length; i++) if (rows[i].kind === "toggle") w[rows[i].id] = rows[i].on;
+        want = w;
+        config.packageChoice = choice();
+    }
+
+    ColumnLayout {
+        anchors.fill: parent
+        anchors.margins: 16
+        spacing: 12
+
+        Label {
+            Layout.fillWidth: true
+            text: "Steamify sets up the SteamOS experience while CachyOS installs. Everything can be changed later with the Steamify app."
+            wrapMode: Text.WordWrap
+            color: pal.windowText
+        }
+
+        RowLayout {
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+            spacing: 16
+
+            ListView {
+                id: list
+                Layout.fillHeight: true
+                Layout.fillWidth: true
+                Layout.preferredWidth: 55
+                clip: true
+                spacing: 4
+                boundsBehavior: Flickable.StopAtBounds
+                model: page.rows
+                ScrollBar.vertical: ScrollBar { policy: ScrollBar.AsNeeded }
+                delegate: Rectangle {
+                    id: row
+                    required property var modelData
+                    required property int index
+                    readonly property var it: modelData
+                    readonly property bool vis: page.shown(it)
+                    readonly property bool selected: vis && index === page.sel
+                    width: list.width - 25
+                    height: vis ? 52 : 0
+                    visible: vis
+                    radius: 4
+                    color: pal.base
+                    border.width: selected ? 2 : 1
+                    border.color: selected ? page.accent : Qt.rgba(pal.windowText.r, pal.windowText.g, pal.windowText.b, 0.15)
+
+                    MouseArea {
+                        anchors.fill: parent; hoverEnabled: true
+                        // Hovering explains a row too, like selecting it.
+                        onEntered: page.sel = row.index
+                        onClicked: { page.sel = row.index; if (row.it.kind === "toggle") page.toggle(row.it.id); }
+                    }
+                    RowLayout {
+                        anchors.fill: parent
+                        anchors.leftMargin: row.it.parent ? 12 : 12
+                        anchors.rightMargin: 12
+                        spacing: 8
+                        Label {
+                            visible: !!row.it.parent
+                            text: "└"
+                            color: pal.text
+                            opacity: 0.6
+                            font.pointSize: 11
+                        }
+                        ColumnLayout {
+                            Layout.fillWidth: true
+                            spacing: 0
+                            Label { Layout.fillWidth: true; text: page.label(row.it); font.bold: true; elide: Text.ElideRight; color: pal.text }
+                            Label { Layout.fillWidth: true; text: page.hint(row.it); elide: Text.ElideRight; color: pal.text; opacity: 0.7; font.pointSize: 8.5 }
+                        }
+                        Switch {
+                            visible: row.it.kind === "toggle"
+                            checked: !!page.want[row.it.id]
+                            onToggled: { page.sel = row.index; page.toggle(row.it.id); }
+                        }
+                        RowLayout {
+                            visible: row.it.kind === "choice"
+                            spacing: 4
+                            RadioButton { text: "Gaming mode"; checked: page.boot === "gamescope"
+                                          onClicked: { page.sel = row.index; page.boot = "gamescope"; } }
+                            RadioButton { text: "Desktop"; checked: page.boot === "desktop"
+                                          onClicked: { page.sel = row.index; page.boot = "desktop"; } }
+                        }
+                    }
+                }
+            }
+
+            // What the selected (or hovered) option does.
+            Rectangle {
+                id: detail
+                readonly property var it: page.rows[page.sel] || ({})
+                readonly property var tx: Texts.items[it.id] || ({})
+                Layout.fillWidth: true
+                Layout.fillHeight: true
+                Layout.preferredWidth: 45
+                radius: 4
+                color: pal.base
+                border.width: 1
+                border.color: Qt.rgba(pal.windowText.r, pal.windowText.g, pal.windowText.b, 0.15)
+                onItChanged: flick.contentY = 0
+
+                Flickable {
+                    id: flick
+                    anchors.fill: parent
+                    anchors.margins: 16
+                    clip: true
+                    contentHeight: col.implicitHeight
+                    boundsBehavior: Flickable.StopAtBounds
+                    ScrollBar.vertical: ScrollBar { policy: ScrollBar.AsNeeded }
+                    ColumnLayout {
+                        id: col
+                        width: flick.width - 12
+                        spacing: 10
+                        Label { Layout.fillWidth: true; text: detail.it.id ? page.label(detail.it) : ""; font.bold: true; font.pointSize: 13
+                                wrapMode: Text.WordWrap; color: pal.text }
+                        Label { Layout.fillWidth: true; text: detail.tx.body || page.hint(detail.it) || ""; wrapMode: Text.WordWrap; color: pal.text }
+                        Label { visible: (detail.tx.changes || []).length > 0; text: "What it changes"; font.bold: true; color: pal.text; topPadding: 4 }
+                        Repeater {
+                            model: detail.tx.changes || []
+                            Label { required property string modelData; Layout.fillWidth: true; text: "•  " + modelData
+                                    wrapMode: Text.WordWrap; color: pal.text }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/archiso/packages_desktop.x86_64 b/archiso/packages_desktop.x86_64
index 6dc5c53..5fd8d02 100644
--- a/archiso/packages_desktop.x86_64
+++ b/archiso/packages_desktop.x86_64
@@ -90,6 +90,7 @@ linux-cachyos
 linux-cachyos-nvidia-open
 linux-cachyos-zfs
 linux-firmware
+cachyos-vapor
 linux-firmware-marvell
 lsb-release
 lsof
diff --git a/archiso/profiledef.sh b/archiso/profiledef.sh
index ce4a089..d862a52 100644
--- a/archiso/profiledef.sh
+++ b/archiso/profiledef.sh
@@ -1,11 +1,20 @@
 #!/usr/bin/env bash
 # shellcheck disable=SC2034
 
-iso_name="cachyos"
-iso_label="COS_$(date --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y%m)"
+iso_name="steamify-cachyos"
+# The label follows the release tag, which GitHub names (iso-1-github-tag.yml): the Steamify version on the ISO
+# (steamify-prepare.sh put it there) plus the tag's date and time, e.g. STEAMIFY_2_9_3_20260929_2030 (ISO 9660:
+# at most 32 characters, A-Z 0-9 _). STEAMIFY_BUILD_STAMP (YYYYMMDD_HHMM, UTC) comes from the tag; the build
+# reads no clock of its own. Built by hand, without a tag: LOCAL.
+_steamify="$(sed -n 's/^VERSION=//p' "${BASH_SOURCE[0]%/*}/airootfs/usr/local/share/steamify/steamify.sh" 2>/dev/null | head -n 1)"
+_stamp="${STEAMIFY_BUILD_STAMP:-LOCAL}"
+iso_label="STEAMIFY_${_steamify:+${_steamify//./_}_}${_stamp}"
+iso_label="${iso_label:0:32}"
 iso_publisher="CachyOS <https://cachyos.org>"
-iso_application="CachyOS Live/Rescue DVD"
-iso_version="$(date --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y.%m.%d)"
+iso_application="Steamify CachyOS Live (based on CachyOS)"
+# The file name (<iso_name>-<iso_version>-x86_64.iso) is the release tag without its v (STEAMIFY_ISO_VERSION
+# from the tag: steamify-cachyos-2.9.3-dev.2026.09.29-2030-x86_64.iso). Built by hand, without a tag: local.
+iso_version="${STEAMIFY_ISO_VERSION:-local}"
 install_dir="arch"
 buildmodes=('iso')
 ## GRUB
@@ -27,6 +36,8 @@ file_permissions=(
   ["/root/.gnupg"]="0:0:700"
   ["/usr/local/bin/choose-mirror"]="0:0:755"
   ["/usr/local/bin/dmcheck"]="0:0:755"
+  ["/usr/local/bin/steamify-install"]="0:0:755"
+  ["/usr/local/bin/steamify-live-theme"]="0:0:755"
   ["/usr/local/bin/calamares-online.sh"]="0:0:755"
   ["/usr/local/bin/remove-nvidia"]="0:0:755"
   ["/usr/local/bin/removeun"]="0:0:755"
@@ -34,4 +45,10 @@ file_permissions=(
   ["/usr/local/bin/prepare-live-desktop.sh"]="0:0:755"
   ["/usr/local/bin/nvidia-module-loader"]="0:0:755"
   ["/usr/local/bin/pkexec-wrapper"]="0:0:755"
+  # steamify-prepare.sh writes this via curl -o, which doesn't carry the
+  # executable bit; calamares-online.sh runs it directly ("$sbin" --defaults
+  # --list) to regenerate Items.qml/items.json at boot, so without this it
+  # silently fails (stderr redirected) and the Steamify page/Summary step
+  # fall back to build-time data.
+  ["/usr/local/share/steamify/steamify.sh"]="0:0:755"
 )
diff --git a/build-calamares-modules.sh b/build-calamares-modules.sh
new file mode 100755
index 0000000..95fdf66
--- /dev/null
+++ b/build-calamares-modules.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+# build-calamares-modules.sh: builds Calamares' packagechooserq module (the
+# QML page the Steamify page runs in) for the ISO. CachyOS's
+# cachyos-calamares-next leaves it out of its own build, so it's built here,
+# out of tree, from CachyOS's Calamares source against the installed
+# cachyos-calamares-next, and installed into airootfs. Run as root in the
+# build container, before buildiso.sh: the package comes from the same repos
+# at the same time as the ISO's, so the module matches the ISO's Calamares.
+# Records the version it was built for next to it (calamares-online.sh
+# compares that with the Calamares it ends up with).
+set -euo pipefail
+cd "$(dirname "$0")"
+dest=archiso/airootfs/usr/lib/calamares/modules/packagechooserq
+src_url=https://github.com/CachyOS/cachyos-calamares/archive/refs/heads/cachyos.tar.gz
+
+pacman -S --needed --noconfirm cachyos-calamares-next cmake extra-cmake-modules \
+    qt6-declarative qt6-tools qt6-svg kcoreaddons yaml-cpp base-devel patch >/dev/null
+work="$(mktemp -d)"
+mkdir -p "$work/src" "$work/cmake"
+# The module and the packagechooser sources it shares (Config, PackageModel),
+# plus the CMake helper its CMakeLists includes, which Calamares doesn't install.
+curl -fsSL "$src_url" -o "$work/calamares.tar.gz"
+tar -xzf "$work/calamares.tar.gz" --strip-components=3 -C "$work/src" \
+    cachyos-calamares-cachyos/src/modules/packagechooserq cachyos-calamares-cachyos/src/modules/packagechooser
+tar -xzf "$work/calamares.tar.gz" --strip-components=2 -C "$work/cmake" \
+    cachyos-calamares-cachyos/CMakeModules/AppStreamHelper.cmake
+# The Steamify page's Summary line shows labels instead of ids.
+patch -s -d "$work/src" -p1 < patches/packagechooserq-steamify-summary.patch
+# KF6CoreAddons before Calamares: Calamares' CMake config needs its target.
+cat > "$work/src/CMakeLists.txt" << EOF
+cmake_minimum_required(VERSION 3.16)
+project(steamify_packagechooserq LANGUAGES CXX)
+set(WITH_QML ON)
+set(WITH_QT6 ON)
+set(qtname Qt6)
+set(QT_VERSION_SUFFIX -qt6)
+find_package(ECM REQUIRED NO_MODULE)
+set(CMAKE_MODULE_PATH \${ECM_MODULE_PATH} /usr/lib/cmake/Calamares $work/cmake \${CMAKE_MODULE_PATH})
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Qml Quick)
+find_package(KF6CoreAddons REQUIRED)
+find_package(Calamares REQUIRED)
+add_subdirectory(packagechooserq)
+EOF
+cmake -S "$work/src" -B "$work/build" -DCMAKE_BUILD_TYPE=Release > "$work/cmake.log" 2>&1 ||
+    { tail -30 "$work/cmake.log"; exit 1; }
+make -s -C "$work/build" -j"$(nproc)"
+install -Dm755 "$work/build/packagechooserq/libcalamares_viewmodule_packagechooserq.so" "$dest/libcalamares_viewmodule_packagechooserq.so"
+install -Dm644 "$work/build/packagechooserq/module.desc" "$dest/module.desc"
+pacman -Q cachyos-calamares-next | cut -d' ' -f2 > "$dest/built-for"
+rm -rf "$work"
+echo "packagechooserq built for cachyos-calamares-next $(cat "$dest/built-for")."
diff --git a/build-live-modules.sh b/build-live-modules.sh
new file mode 100755
index 0000000..9b81ee7
--- /dev/null
+++ b/build-live-modules.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+# build-live-modules.sh: builds Steamify's power-off fix for the live ISO's
+# kernels, so the Steam Machine stays off after shutting down from the live
+# session (recent kernels keep a firmware wake bit set; see Steamify's
+# patches/steamify-fremont-poweroff.c). Run as root in the build container,
+# after steamify-prepare.sh and before buildiso.sh: the headers come from the
+# same repos at the same time as the ISO's kernels, so the versions match.
+# The module checks for Fremont itself and does nothing on other hardware.
+set -euo pipefail
+cd "$(dirname "$0")"
+src=archiso/airootfs/usr/local/share/steamify/steamify-fremont-poweroff.c
+[[ -f "$src" ]] || { echo "No $src: run steamify-prepare.sh first." >&2; exit 1; }
+
+pacman -S --needed --noconfirm base-devel clang llvm lld linux-cachyos-headers linux-cachyos-lts-headers >/dev/null
+for build in /usr/lib/modules/*/build; do
+    kver="$(basename "$(dirname "$build")")"
+    # A fresh folder per kernel: `make clean modules` in one call makes
+    # kbuild re-run itself endlessly for an external module.
+    work="$(mktemp -d)"
+    cp "$src" "$work/"
+    echo 'obj-m += steamify-fremont-poweroff.o' > "$work/Makefile"
+    # CachyOS's kernels differ in compiler (linux-cachyos is clang-built):
+    # build with the one the kernel was built with.
+    llvm=()
+    grep -q '^CONFIG_CC_IS_CLANG=y' "$build/.config" && llvm=(LLVM=1)
+    make -s -C "$build" M="$work" "${llvm[@]}" modules
+    install -Dm644 "$work/steamify-fremont-poweroff.ko" \
+        "archiso/airootfs/usr/lib/modules/$kver/extra/steamify-fremont-poweroff.ko"
+    rm -rf "$work"
+    echo "Power-off fix built for $kver."
+done
+install -Dm644 /dev/stdin archiso/airootfs/etc/modules-load.d/steamify-fremont-poweroff.conf <<< 'steamify-fremont-poweroff'
diff --git a/buildiso.sh b/buildiso.sh
index 7effbf4..055d50f 100755
--- a/buildiso.sh
+++ b/buildiso.sh
@@ -76,6 +76,10 @@ for sig in TERM HUP QUIT; do
 done
 trap 'trap_exit INT "$(gettext "Aborted by user! Exiting...")"' INT
 trap 'trap_exit USR1 "$(gettext "An unknown error has occurred. Exiting...")"' ERR
-trap 'trap_exit EXIT "$(gettext "An unknown error has occurred. Exiting...")"' EXIT
+# Steamify: unconditional, so it printed "An unknown error has occurred"
+# (and tried to self-kill with the bogus signal name EXIT) after every
+# build, success included. Only report it, and only exit through
+# trap_exit's self-kill, on an actual nonzero exit.
+trap 'ec=$?; if [[ $ec -ne 0 ]]; then trap_exit EXIT "$(gettext "An unknown error has occurred. Exiting...")"; else umount_fs; fi' EXIT
 
 run_build "${build_list_iso}"
diff --git a/patches/packagechooserq-steamify-summary.patch b/patches/packagechooserq-steamify-summary.patch
new file mode 100644
index 0000000..4f0e39e
--- /dev/null
+++ b/patches/packagechooserq-steamify-summary.patch
@@ -0,0 +1,81 @@
+diff -ruN a/packagechooserq/PackageChooserQmlViewStep.cpp b/packagechooserq/PackageChooserQmlViewStep.cpp
+--- a/packagechooserq/PackageChooserQmlViewStep.cpp	2026-09-28 16:56:21
++++ b/packagechooserq/PackageChooserQmlViewStep.cpp	2026-09-28 16:57:29
+@@ -17,6 +17,12 @@
+ #include "utils/System.h"
+ #include "utils/Variant.h"
+ 
++#include <QFile>
++#include <QHash>
++#include <QJsonArray>
++#include <QJsonDocument>
++#include <QJsonObject>
++
+ CALAMARES_PLUGIN_FACTORY_DEFINITION( PackageChooserQmlViewStepFactory, registerPlugin< PackageChooserQmlViewStep >(); )
+ 
+ PackageChooserQmlViewStep::PackageChooserQmlViewStep( QObject* parent )
+@@ -35,9 +41,61 @@
+ QString
+ PackageChooserQmlViewStep::prettyStatus() const
+ {
+-    //QString option = m_pkgc;
+-    //return tr( "Install option: %1" ).arg( option );
+-    return m_config->prettyStatus();
++    // Steamify page (steamify-cachyos-live-iso): its choice is Steamify's
++    // item ids ("boot" = start in the desktop, "none" = nothing on); show
++    // their labels, from the rows calamares-online.sh writes next to the
++    // page, instead of the raw ids. Any other use keeps the stock text.
++    const QString choice = m_config->packageChoice();
++    QFile rows( QStringLiteral( "/usr/local/share/steamify/qml/items.json" ) );
++    if ( moduleInstanceKey().id() != QStringLiteral( "steamifypage" ) || choice.isEmpty()
++         || !rows.open( QIODevice::ReadOnly ) )
++    {
++        return m_config->prettyStatus();
++    }
++    QHash< QString, QString > labels;
++    const auto items = QJsonDocument::fromJson( rows.readAll() ).array();
++    for ( const auto& item : items )
++    {
++        const auto row = item.toObject();
++        labels.insert( row.value( QStringLiteral( "id" ) ).toString(),
++                       row.value( QStringLiteral( "label" ) ).toString() );
++    }
++    if ( labels.isEmpty() )
++    {
++        return m_config->prettyStatus();
++    }
++    QStringList on;
++    bool desktop = false, gaming = false;
++    for ( const auto& part : choice.split( QLatin1Char( ',' ) ) )
++    {
++        const QString id = part.trimmed();
++        if ( id.isEmpty() || id == QStringLiteral( "none" ) )
++        {
++            continue;
++        }
++        if ( id == QStringLiteral( "boot" ) )
++        {
++            desktop = true;
++            continue;
++        }
++        gaming = gaming || id == QStringLiteral( "gaming" );
++        on << labels.value( id, id ).toHtmlEscaped();
++    }
++    if ( gaming )
++    {
++        on << ( desktop ? tr( "Starts in the desktop" ) : tr( "Starts in gaming mode" ) );
++    }
++    if ( on.isEmpty() )
++    {
++        return tr( "Steamify: <strong>nothing</strong>" );
++    }
++    QString status = tr( "Steamify:" ) + QStringLiteral( "<ul>" );
++    for ( const auto& item : on )
++    {
++        status += QStringLiteral( "<li>" ) + item + QStringLiteral( "</li>" );
++    }
++    status += QStringLiteral( "</ul>" );
++    return status;
+ }
+ 
+ bool
diff --git a/steamify-customize.sh b/steamify-customize.sh
new file mode 100755
index 0000000..309222d
--- /dev/null
+++ b/steamify-customize.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+# steamify-customize.sh <live root>: changes to the live system after its
+# packages are installed (mkarchiso runs it, see modify_mkarchiso in
+# util-iso.sh); files in airootfs are copied before the packages, which
+# overwrite them.
+set -euo pipefail
+root="$1"
+# Nothing yet: the live session keeps CachyOS's own name (only the installer
+# says "CachyOS with Steamify", see calamares-online.sh).
+exit 0
diff --git a/steamify-prepare.sh b/steamify-prepare.sh
new file mode 100755
index 0000000..f45a60f
--- /dev/null
+++ b/steamify-prepare.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+# steamify-prepare.sh [steamify checkout]: puts the Steamify bundle on the
+# ISO (archiso/airootfs/usr/local/share/steamify/steamify.sh), used by the
+# installer's Steamify step, and what its Steamify page shows (qml/). Built from a checkout when given, else the
+# newest release, or exactly release $STEAMIFY_VERSION (e.g. 2.9.2: the ISO release workflow, whose tag names
+# the version). Run before buildiso.sh.
+set -euo pipefail
+rel="https://github.com/theupriser/steamify-cachyos/releases/${STEAMIFY_VERSION:+download/v$STEAMIFY_VERSION}"
+[[ -n "${STEAMIFY_VERSION:-}" ]] || rel+="latest/download"
+src_ref="${STEAMIFY_VERSION:+v$STEAMIFY_VERSION}"; src_ref="${src_ref:-main}"
+dest="$(cd "$(dirname "$0")" && pwd)/archiso/airootfs/usr/local/share/steamify/steamify.sh"
+mkdir -p "$(dirname "$dest")"
+if [[ -n "${1:-}" ]]; then
+    (cd "$1" && .github/tools/bundle.sh "$dest")
+else
+    curl -fsSL "$rel/steamify.sh" -o "$dest"
+fi
+# The power-off fix's source, for build-live-modules.sh (live session).
+poweroff="$(dirname "$dest")/steamify-fremont-poweroff.c"
+if [[ -n "${1:-}" ]]; then
+    cp "$1/patches/steamify-fremont-poweroff.c" "$poweroff"
+else
+    curl -fsSL "https://raw.githubusercontent.com/theupriser/steamify-cachyos/$src_ref/patches/steamify-fremont-poweroff.c" -o "$poweroff"
+fi
+# The installer's Steamify page (/usr/local/share/steamify-installer/
+# SteamifyPage.qml) shows the app's explanations (Theme.qml, Texts.qml, from the
+# checkout, else the newest release's app) and its rows (Items.qml: this
+# fallback until calamares-online.sh writes the real list).
+qml="$(dirname "$dest")/qml"
+rm -rf "$qml"; mkdir -p "$qml"
+if [[ -n "${1:-}" ]]; then
+    cp "$1"/ui/qml/{Theme,Texts}.qml "$qml/"
+else
+    curl -fsSL "$rel/steamify-app.tar.gz" |
+        tar -xz -C "$qml" --strip-components=2 ui/qml/Theme.qml ui/qml/Texts.qml
+fi
+cp "$(cd "$(dirname "$0")" && pwd)/archiso/airootfs/usr/local/share/steamify-installer/Items.qml" "$qml/"
+printf '%s\n' 'singleton Theme 1.0 Theme.qml' 'singleton Texts 1.0 Texts.qml' 'singleton Items 1.0 Items.qml' > "$qml/qmldir"
+grep -q -- '--defaults' "$dest" || { echo "This Steamify has no --defaults (needs 2.6.0 or newer)." >&2; exit 1; }
+chmod 755 "$dest"
+# Temporary: cachyos-calamares-next 3.4.2-13 is linked against Boost 1.91
+# while the repos ship 1.92, so the installer doesn't start. Boost's
+# libraries carry their version in the name: 1.91's sit next to 1.92's.
+# Drop this once CachyOS rebuilds the installer.
+boost=boost-libs-1.91.0-2-x86_64.pkg.tar.zst
+libs="$(cd "$(dirname "$0")" && pwd)/archiso/airootfs"
+curl -fsSL "https://archive.archlinux.org/packages/b/boost-libs/$boost" -o "/tmp/$boost"
+tar -xf "/tmp/$boost" -C "$libs" --wildcards 'usr/lib/libboost_*.so.1.91.0'
+rm -f "/tmp/$boost"
+echo "Steamify $(grep -m1 '^VERSION=' "$dest" | cut -d= -f2) on the ISO."
diff --git a/util-iso.sh b/util-iso.sh
index 30010e1..2be2f76 100755
--- a/util-iso.sh
+++ b/util-iso.sh
@@ -104,7 +104,14 @@ generate_version_tag() {
     local _profile="$1"
     local _version="$2"
     if [ "$_profile" == "desktop" ]; then
-        echo "${_version}" > ${src_dir}/archiso/airootfs/etc/version-tag
+        # Steam Machine edition: CachyOS Hello won't install an ISO newer
+        # than CachyOS's newest release (it calls it a testing ISO), so the
+        # tag is that release, the one this build follows; the build's own
+        # date goes to /etc/steammachine-iso-build.
+        local _release
+        _release="$(curl -fsS --max-time 20 https://cachyos.org/versions.json | grep -o '"desktopISOVersion":"[0-9]*"' | grep -o '[0-9]\+')"
+        echo "${_release:-${_version}}" > ${src_dir}/archiso/airootfs/etc/version-tag
+        echo "${_version}" > ${src_dir}/archiso/airootfs/etc/steammachine-iso-build
     fi
 }
 
@@ -122,6 +129,10 @@ modify_mkarchiso() {
     else
         msg "mkarchiso is already patched!"
     fi
+    # Steamify: live-system changes after the packages (they overwrite airootfs).
+    if ! grep -q 'steamify-customize.sh' /usr/bin/mkarchiso; then
+        sudo sed "s#_run_once _make_customize_airootfs#_run_once _make_customize_airootfs\n\t${src_dir}/steamify-customize.sh \"\${pacstrap_dir}\"#" -i /usr/bin/mkarchiso
+    fi
 }
 
 prepare_profile(){
@@ -129,7 +140,10 @@ prepare_profile(){
 
     info "Profile: [%s]" "${profile}"
 
-    local _iso_version="$(date +%y%m%d)"
+    # The release tag without its v when the release workflow builds (STEAMIFY_ISO_VERSION): the boot menu
+    # and /etc/steammachine-iso-build name the same release as the file, label and tag (no clock of its own).
+    # By hand, without a tag: local.
+    local _iso_version="${STEAMIFY_ISO_VERSION:-local}"
     change_grub_version "${_iso_version}"
 
     # Fetch up-to-date version of CachyOS repo mirrorlist
@@ -187,11 +201,22 @@ run_build() {
 
     [ -d "$outFolder/$_profile" ] || mkdir -p "$outFolder/$_profile"
     cd ${work_dir}/archiso/
-    sudo mkarchiso -v -w ${work_dir} -o "$outFolder/$_profile" ${work_dir}/archiso/
-    sudo chown $USER $outFolder
+    # sudo drops the environment: the release tag's file name and label (profiledef.sh) must get through.
+    sudo --preserve-env=STEAMIFY_ISO_VERSION,STEAMIFY_BUILD_STAMP mkarchiso -v -w ${work_dir} -o "$outFolder/$_profile" ${work_dir}/archiso/
+    # $USER is empty when this runs as root (e.g. in a container): an empty
+    # chown failed and aborted the rest (the build was done, the exit code 1).
+    sudo chown "${SUDO_USER:-${USER:-$(id -un)}}" "$outFolder"
 
-    cp ${work_dir}/iso/arch/pkglist.x86_64.txt "$outFolder/$_profile/$(gen_iso_fn).pkgs.txt"
-    mv "$outFolder/$_profile/cachyos-$(date --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y.%m.%d)-x86_64.iso" "$outFolder/$_profile/${iso_file}"
+    # Steamify: profiledef.sh's iso_name (steamify-cachyos) names the ISO, so
+    # CachyOS's rename only applies when mkarchiso wrote cachyos-<date>.
+    local built="$outFolder/$_profile/cachyos-$(date --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +%Y.%m.%d)-x86_64.iso"
+    if [[ -e "$built" ]]; then
+        mv "$built" "$outFolder/$_profile/${iso_file}"
+    else
+        built="$(ls -t "$outFolder/$_profile"/*.iso | head -1)"
+        iso_file="$(basename "$built")"
+    fi
+    cp ${work_dir}/iso/arch/pkglist.x86_64.txt "$outFolder/$_profile/${iso_file%.iso}.pkgs.txt"
 
     msg "Done [Build ISO] ${iso_file}"
     msg "Finished building [%s]" "${_profile}"