Typically used to fix "stuck on logo" issues, boot loops, or software corruption.
Ensure you have all parts of the archive. Use a tool like WinRAR or 7-Zip to extract the main firmware file (usually named allupgrade_ms638_sos.bin or similar). Download MS638 PC822 3840x2160 Mitashi Ref35 part03 rar
Hold the button on the TV (not the remote) and plug it into the wall. Typically used to fix "stuck on logo" issues,
Wait for the LED indicator to blink rapidly, indicating the update is in progress. Download MS638 PC822 3840x2160 Mitashi Ref35 part03 rar
Do not power off the TV during this process, as it can permanently damage the motherboard.
.rar (Part 3 of a larger archive). You must download all parts (part01, part02, etc.) to successfully extract the final firmware file. Where to Download