Before downloading any files, you must confirm your hardware specs. Using the wrong firmware can permanently "brick" your head unit.

Download an app like AIDA64 or CPU-Z from the Play Store. API Level 27: Android 8.1 API Level 31/32: True Android 12

Often has the most extensive library of firmware for specific boards like the YT-9213A or AC8227L .

A "fake" Android 12 firmware that is stable is often better than a "real" one that causes lag on the 8227L's aging processor. How To Update Your Android Head Unit + Apps

Connect the head unit to a computer via a .

Load the from your firmware package into the SP Flash Tool .