.rar (This is part 3 of a multi-part archive; you will likely need parts 01 and 02 to successfully extract the full firmware).
Press and hold the Power button on the TV while plugging it back into the wall. Download MT5522S PC822 3840x2160 Skyline part03 rar
Insert the USB drive into the TV's USB port. A red indicator light should blink, signaling the
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
Turn off the TV and unplug it from the power source.
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 .