Using the wrong firmware for your specific panel model (even with the same motherboard) can result in a distorted image or a "bricked" TV. Always verify the Panel Model number (found on a sticker inside the TV) against the firmware source, such as KenotronTV .
If you have all the parts of the archive, the standard procedure for these boards is: Download MT5522S PC822 3840x2160 Skyline part03 rar
A red indicator light should blink, signaling the update has started. Wait until it flashes rapidly (often changing from red to green) before removing the USB and restarting the TV. Using the wrong firmware for your specific panel
Power Supply and Display Troubleshooting Guide | PDF - Scribd Download MT5522S PC822 3840x2160 Skyline part03 rar