In user forums (XDA, 4PDA, Reddit), "AC8257 firmware WORK" usually means:
Extract the downloaded .zip file and copy the contents (often named update_car , 8257 , or .bin files) directly to the root directory of the USB drive. Do not keep them in a subfolder. 3. Flash the Firmware How To Update Your Android Head Unit + Apps Ac8257 Firmware WORK
The AC8257 is a highly integrated Wi-Fi/Bluetooth combo chip designed by Intel. Here are a few reviews and insights on the firmware work related to this chip: In user forums (XDA, 4PDA, Reddit), "AC8257 firmware
There is no "universal" update. A firmware file that works on a 1024x600 screen will destroy a 1280x720 screen. A file for a unit with a AC8257 AutoChips board will fail on a AC8257 YT9218 board. Flash the Firmware How To Update Your Android