Place the extracted firmware file (e.g., all_upgrade_v638.bin ) directly into the root directory of the USB drive (not inside any folder). Initiate Update: Power off the TV and unplug it from the wall. Insert the USB drive into the USB 2.0 port on the TV.
Mitashi 55V20 (also found in some SANYO and Chinese generic models) Resolution: 3840x2160 (Ultra HD / 4K)
If your TV is stuck on a logo (boot loop) or showing a "System Damaged" error, a USB recovery is the standard fix.
Once the update reaches 100%, the TV will usually reboot. Remove the USB drive immediately to prevent it from entering the update cycle again. Troubleshooting & Sources
Plug the TV back into the power outlet while continuing to hold the button.
To successfully extract the firmware, you must download all parts (Part 1 through Part 10).
Downloading incorrect firmware can permanently damage your TV's mainboard. Ensure your board number matches exactly.