TP.MS638.PC822 (also commonly listed as MS638 PC822).
Keep holding the button until the update progress bar appears on the screen. Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar
Offers a dedicated download section for the TP.MS638.PC822 board. Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar