Use a USB drive (8GB or smaller is often more stable for flashing). File System: Format the drive to FAT32 .
Press and hold the Power button on the TV panel, then plug in the power cord. Release the button once the LED starts flashing.
Confirm your board model is exactly LDD.M3663.A48 .
Wait until the LED stops flashing or turns a solid color (this usually takes 1–3 minutes). Do not unplug the TV during this process . Restart: Unplug the USB drive and power the TV on normally. 4. Troubleshooting Common Issues
