Let me know the panel model number (found on the sticker behind the screen), and I can help you find the exact match!
Turn off the power to the TV. Insert the USB drive into the USB port of the TP.MS338.PB801 board. Flashing Process: Press and hold the Power Button on the TV panel. Plug the TV into the main power outlet.
The standby indicator light should start blinking rapidly. This means the software is being written to the board. during this stage.