: Do not power off or remove the USB while the LED is blinking, as this can brick the board.

: Once the LED stops blinking and the TV restarts, remove the USB drive.

For the universal LCD/LED driver board, you can find the specific 1366x768 USB firmware on specialist repair forums like Lab-One Forum . These files are usually provided in .rar or .zip archives and contain the .bin or .img bios files needed for the update. Download and Installation Guide

Copy the firmware file (often named upgrade_loader.pkg or a .bin file) directly to the of the USB—do not place it in any folders. Install the Update : Power off your TV/monitor completely. Plug the USB drive into the board's USB port.

: It is highly recommended to backup your original BIOS before performing any updates, as installing incorrect firmware can cause permanent hardware failure. RR8501 USB Firmware Software Bios Bin - Lab-One Forum