If you want to push your updated 8227L unit to its absolute limit, consider implementing these quick tweaks:
Once finished, the unit will boot into the new system. It is highly recommended to go into settings and perform a Factory Data Reset immediately to ensure no old system cache causes glitches with the new software. Pro-Tips for "Extra Quality" Performance android auto firmware latest update 8227l extra quality
Many units will automatically detect the files on the USB and pop up a prompt asking if you want to update. Click "Yes" or "OK". If you want to push your updated 8227L
Newer software builds optimize background processes, allowing your head unit to start up the moment you turn the key. Click "Yes" or "OK"
This is the holy grail for Android head unit firmware. While you will need to use a browser translator, their community has archived almost every 8227L firmware version in existence.