Xyauto 9212b Firmware Update -

The MCU (Microcontroller Unit) controls hardware-level functions: radio tuner, amp chip, CAN bus, button illumination, etc. Mismatched MCU firmware is a common cause of bricking.

To find it:

A typical XYAuto firmware zip file looks like: xyauto 9212b firmware update

Do not download files with generic names like firmware.zip unless they come with a README matching your device. Do not download files with generic names like firmware

If auto-detection fails: