| Problem | Reported by User | Working Solution | |----------|------------------|-------------------| | Black screen after flash, only backlight works | moka88 (XDA), dobro savke (XDA) | Wrong screen driver was flashed. Use mouse to navigate and reflash correct firmware. If Bluetooth still works, you can push correct files via ADB. | | Unit stuck on homepage, no touch function | Kristal91 (XDA) | Used USB mouse to navigate → reset → performed touch relearn. | | Bootloop after MCU update | Marchnz (XDA) | Must update system firmware and MCU from same release package. Updating only one causes mismatch. | | Audio completely gone after flash | HTCManía thread | Audio routing (CAN bus/AMP control) is in MCU firmware. Reflash correct MCU update [15†L34-L38]. | | Wrong RAM/Storage capacity reported | Multiple XDA users | Flashing wrong preloader ( preloader_4g.bin vs preloader_8g.bin ) caused 8 GB unit to show 4 GB. |
Press and hold the reset switch using a paperclip while turning the car ignition key to the ACC position. Ac8257 Firmware WORK
Step 1: Identify Your Exact Mainboard and Firmware Developer | Problem | Reported by User | Working
Before any modification, use SP Flash Tool's readback function to create a complete dump of your original firmware. This provides a guaranteed recovery path. | | Unit stuck on homepage, no touch
Use this approach if your screen is responsive and you are upgrading to resolve software bugs or add features like wireless Android Auto.
If you own an aftermarket Android car stereo, chances are high that it runs on the processor. This chip powers hundreds of "Android 10/11/12" head units sold under brand names like Eonon, Xtrons, Witson, and generic "no-name" Android players.