Go to and tap "Build Number" 7 times. Then go to Developer Options and set:
This method is useful if OTA is not available or you have downloaded a specific firmware file.
The most extensive resource for this platform is the Allwinner T3 Quad Core Head Unit thread on 4PDA. It covers everything from GAPPS patches and MCU updates to fixing radio reception and Bluetooth OBD issues.
10” Android car radio hidden menus and passwords K2001n T3
Keep your vehicle engine running throughout the entire process. Cutting power mid-flash will corrupt the bootloader and permanently brick the unit. Troubleshooting Common Flashing Failures Direct Cause Immediate Solution No Touchscreen Input Flipped resolution/driver configuration.
Additional equalizer settings and a fix for the "subwoofer phase" issue that caused bass cancellation.
A firmware update in 2021 often addresses BT pairing issues. If it still fails, the ELM327 device may be incompatible with the Android version.
Based on changelogs recovered from XDA and Russian 4PDA forums, here is what v2021 actually fixed:
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