Keep holding the button until the update progress bar appears on the screen.
Primarily found in Mitashi 65-inch 4K models (likely the "Ref65" mentioned in your query) and other brands like Polar or Asano. Resolution: 3840x2160 (Ultra HD/4K). Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar
This firmware is typically used to fix "stuck on logo" (boot loop) issues or to reprogram the TV after replacing the motherboard. Where to Find the Download Keep holding the button until the update progress
Offers a dedicated download section for the TP.MS638.PC822 board. Download MS638 PC822 3840x2160 Mitashi Ref65 part02 rar