I can only see 3.5.4
If you are on a beta program you can PM me your WiFi MAC.
If you have an (encrypted) update.upx you can park it on /sdcard/
Code:
adb push update.upx /sdcard/
It might eventually discover it or you can poke it:
Code:
adb shell am start -a onyx.settings.action.firmware
If you are doing something "against the grain" (rollback or changing Chinese <-> Int'l) then you need stock recovery and adb sideload or else a custom recovery.