Plug the power back in. The indicator light (if available) should begin flashing rapidly, indicating the update is in progress.
Extract the downloaded .rar file and copy the .bin firmware file directly to the root directory of the USB drive (do not put it in a folder). Download 3663LUA A81 1280x768 Firmware USB rar
Unplug the power from your TV or controller board. Insert USB: Plug the drive into the board's USB port. Plug the power back in
Once the light stops flashing or changes color, unplug the USB drive and restart the device. Download 3663LUA A81 1280x768 Firmware USB rar