Download the official .zip or .img firmware file from the manufacturer (e.g., Idoing or CAIXI Store ).

Wait for the "Start Update" or "Detecting USB" message to appear on a black screen. ⚠️ Critical Safety Tips

Yt9216bj-00012-v001 refers to a specific firmware version for XY Auto Android head units (car stereos)

Plug the USB drive into the unit's (usually the 4-pin or 6-pin cable in the glovebox). Go to Settings > System > System Upgrade . Select Local Upgrade . The unit should detect the file and prompt you to restart. Method B: Recovery Mode (Hard Reset) If the system is stuck or won't boot: Insert the USB drive.

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