To update or reinstall the stock firmware, you must first gather the necessary files.
Remove the USB drive, unplug the main power once more, and then turn the TV back on. 4. Post-Installation Tips Download MT5522 PC821 3840x2160 USB part02 rar
Plug the USB drive into a USB port on the motherboard. To update or reinstall the stock firmware, you
Firmware for this board can be found on technical repair sites such as Software Zone or repository sites like KenotronTV . unplug the main power once more
Turn off the TV and unplug it from the main power.