If you are using the USB recovery method, follow these general steps:
A common repository for board-specific firmware. You can find entries for the TP.MS638.PC822 board here. Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar
Hold the on the TV (not the remote) and plug the power cord back in. If you are using the USB recovery method,
Format a USB flash drive (FAT32) and copy the extracted firmware file to the root directory (do not put it in a folder). Flash Firmware: Unplug the TV. Insert the USB drive into the TV's USB port. Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar