: Do not turn off the car or touch the unit during the 5–8 minute installation process, as this can brick the device. Essential Safety Tips Backup Your Data

(Released late 2023/2024; note that higher versions often "fake" being Android 10/11 while remaining on Android 9). MCU Updates

: Version 1.73 is widely considered stable; some users report bugs in newer iterations like 1.81 . How to Find Your New Firmware

Never install firmware that has a different MCU prefix than your own. For example, if your MCU starts with TZY , do not install a file meant for an XY unit, even if they both use the AC8257 chip.

A firmware update for your AC8257-based head unit typically addresses several critical performance areas: