diff --git a/docs/evidence/framey-emuchievements-arm-2026-10-26.md b/docs/evidence/framey-emuchievements-arm-2026-10-26.md
new file mode 100644
index 0000000..f480dd7
--- /dev/null
+++ b/docs/evidence/framey-emuchievements-arm-2026-10-26.md
@@ -0,0 +1,40 @@
+# Emuchievements ARM64 hash helper feasibility, 26 October 2026
+
+The exact official Emuchievements 2.0.5 archive (store ID 28, SHA-256
+`98dcb443e81b9f9011cfe77c69eb659869c8e2df2df8b0a443df66cbfc2f5a89`)
+contains an x86_64 `Emuchievements/bin/hash`. Frame Control still blocks
+that archive on ARM64; this experiment did not install the plugin.
+
+The upstream source commit
+[`8567e94befffc943434b2adb842487274815f8bb`](https://github.com/EmuDeck/Emuchievements/commit/8567e94befffc943434b2adb842487274815f8bb)
+declares version 2.0.5. Its `src/py/main.py` matches the published ZIP's
+`Emuchievements/main.py` byte for byte (SHA-256
+`d4e72f136c94e48919575937ec4190f28864cc259eb111ef47f0df99f5912645`).
+The pinned build dependencies at that commit are libarchive
+`b3be94ba4f36943745e64a6a0a3c21c2d1281d3c`, libchdr
+`a20e04c12c0c20048bf771da6df7aa2e51f5e0cb`, and rcheevos
+`85a3209398e576d79170f569fcddf277640f3f06`.
+
+On a separate Linux host, the version-matched source and submodules built an
+x86_64 `hash` with CMake. It and the official x86_64 binary both returned
+`ff78ca6c21ac11504dbddbd5d4e7524a` for one synthetic `.rom` file. An
+isolated Debian cross-build using `gcc-aarch64-linux-gnu` and
+`g++-aarch64-linux-gnu` produced an AArch64 binary with SHA-256
+`9c7aedb80bdd64941aa5dd9b41f9bb8471411c812e04c7ee7d60486779d99997`.
+It links to `liblzma.so.5`, `libstdc++.so.6`, `libgcc_s.so.1`, and `libc.so.6`.
+
+A real Frame test acquired `/tmp/frame-test.lock` atomically with a unique
+owner before reading the device. SteamVR activity was **3** (standby),
+proximity raw **3.0625**, and battery **100%**. The ARM64 helper ran against
+the same synthetic ROM in a private `/tmp` directory, exited 0, and returned
+the same hash. The owned directory and lock were removed. No normal service,
+power setting, Steam library, real ROM, or installed plugin was changed.
+The separate host's source/build directory was also removed after the test.
+
+This proves only a single-file helper path. The official ZIP remains blocked
+because it still bundles x86_64 bytes. A release-ready port needs a packaged
+ARM64 helper with GPL-3.0 source and license compliance, format-specific hash
+coverage (including archives and CHD), a managed plugin transaction, actual
+Decky backend and frontend checks, and cleanup. RetroAchievements login,
+real ROM scanning, wearer-visible VR, and physical controller use remain
+unverified.
diff --git a/docs/framey-compatibility.md b/docs/framey-compatibility.md
index beb2a7b..80e39b6 100644
--- a/docs/framey-compatibility.md
+++ b/docs/framey-compatibility.md
@@ -288,7 +288,7 @@ All published Linux native payloads in this snapshot are x86_64; no published aa
 | Fantastic | bin/backend | Fan backend/driver is Deck-specific; an ARM64 rebuild would not provide compatible Frame hardware. |
 | PowerTools | bin/libryzenadj.so, bin/ryzenadj, bin/backend | RyzenAdj and AMD power backend cannot control an ARM64 Frame SoC. |
 | Memory Deck | bin/libscanmem.so.1.0.0 | libscanmem must be rebuilt for aarch64 and validated against target process architecture; memory writes were not tested. |
-| Emuchievements | bin/hash | The bin/hash helper needs an ARM64 build and cross-platform hashing tests; no ARM64 artifact is published. |
+| Emuchievements | bin/hash | A source-matched ARM64 bin/hash helper matched the official x86_64 helper on one synthetic ROM on the real Frame (docs/evidence/framey-emuchievements-arm-2026-10-26.md). The official ZIP still bundles x86_64 bytes and remains blocked; format coverage, packaging, plugin backend/UI, login and worn VR are unverified. |
 | MoonDeck | python/externals/yarl/_quoting_c.cpython-313-x86_64-linux-gnu.so, python/externals/aiohttp/_http_parser.cpython-313-x86_64-linux-gnu.so, python/externals/aiohttp/_websocket/reader_c.cpython-313-x86_64-linux-gnu.so, python/externals/aiohttp/_websocket/mask.cpython-313-x86_64-linux-gnu.so, python/externals/aiohttp/_http_writer.cpython-313-x86_64-linux-gnu.so, … 26 total; full list in JSON | Rebuild vendored CPython 3.13 extension wheels for the headset Python ABI and ARM64; buddy/helper dependencies also need ports. |
 | Controller Tools | bin/backend | Native backend needs an ARM64 build and controller/HID dependencies; its direct websocket also bypasses the Framey bridge. |
 | DeckMTP | bin/umtprd | umtprd needs ARM64 libusb/MTP dependencies and USB gadget permissions; root user-service blocker remains. |
diff --git a/ui/framey-compatibility.json b/ui/framey-compatibility.json
index 8b01de9..0cbd77d 100644
--- a/ui/framey-compatibility.json
+++ b/ui/framey-compatibility.json
@@ -1790,7 +1790,7 @@
       },
       "backend": "Python + native payload",
       "hardware": "No specific hardware requirement detected statically; runtime requirements unverified.",
-      "nativePort": "The bin/hash helper needs an ARM64 build and cross-platform hashing tests; no ARM64 artifact is published.",
+      "nativePort": "A source-matched ARM64 bin/hash helper matched the official x86_64 helper on one synthetic ROM on the real Frame (docs/evidence/framey-emuchievements-arm-2026-10-26.md). The official ZIP still bundles x86_64 bytes and remains blocked; format coverage, packaging, plugin backend/UI, login and worn VR are unverified.",
       "uiSurfaces": [
         "local/Steam routes",
         "toasts",