With the unit turned off, insert the USB drive. Press and hold the Power button and the Reset button (usually a small pinhole near the SD card slot) simultaneously. Release Reset first, then Power after 5 seconds. The screen should turn green or blue, indicating "Recovery Mode."
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Use the volume knob or physical steering wheel buttons (if connected) to navigate to "Apply Update from USB." Select it. The system will verify the F9212 signature. If successful, a progress bar will load. With the unit turned off, insert the USB drive