Warning: If you download a file with a .pac extension, that is a factory tool flash (requires Windows PC and USB A-to-A cable). .pac files are hard mode.
The firmware is split into two parts: The Android System (AC8257) and the MCU (Microcontroller Unit). Even if the Android version works, the MCU controls your physical buttons, CAN bus (steering wheel controls), and amplifier. A mismatched MCU means no sound or buttons. Ac8257 Firmware WORK
It provides native support for CarPlay , Mirror Link , OBD2 diagnostics, and TPMS (Tire Pressure Monitoring Systems). Warning: If you download a file with a