Use a USB flash drive (ideally 2.0 and 8GB or smaller) and format it to FAT32 .
Unplug the power from your TV or controller board. Insert USB: Plug the drive into the board's USB port. Download 3663LUA A81 1280x768 Firmware USB rar
Plug the power back in. The indicator light (if available) should begin flashing rapidly, indicating the update is in progress. Use a USB flash drive (ideally 2