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+# Fetch upstream
+- `repo forall -vc "git reset --hard"`
+- `repo init -b refs/tags/5.4.0`
+- `repo sync -j8`
+- `export PATH="$PATH:/usr/sbin:/mnt/disk0205/ralyxos/sign/out/bin"`
+- `./calyx/scripts/pixel/device.sh shiba`
+
+
+
+# Version Code
+- `vendor/calyx/config/version.mk`
+
+
+
+# Update server
+- `packages/apps/SystemUpdater/app/src/main/java/org/calyxos/systemupdater/update/manager/UpdateManagerImpl.kt`
+- `packages/apps/Updater/res/values/config.xml`
+- (`development/build/tools/mk_sdk_repo_xml.sh`)
+
+
+
+# Include Updater App
+- `vendor/calyx/config/common.mk`
+
+
+
+# Notes
+### Use of `$OFFICIAL_BUILD`
+- `vendor/calyx/build/envsetup.sh` ()
+- `vendor/calyx/config/version.mk` (Version suffix)
+- `vendor/calyx/config/common.mk` (Whether to ship updater)
+
+### Include own prebuilt `.apk` files
+- Create file dir like `prebuilts/calyx/fdroid/Android.mk`
+- Add line to `vendor/calyx/config/common.mk`
+- https://adityatelange.in/blog/aosp/aosp-adding-prebuilt-apk