Insert the USB drive into the TV's USB port.
Press and hold the Power button on the TV while plugging it back into the wall.
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 . Download MT5522S PC822 3840x2160 Skyline part03 rar
Typically used for motherboard replacement, system recovery from a "boot loop," or updating the smart TV's software. General Installation Steps
Use a tool like WinRAR or 7-Zip to extract the files (usually named allupgrade_5522...pkg or similar) to the root of a FAT32-formatted USB flash drive . Insert the USB drive into the TV's USB port
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.
Turn off the TV and unplug it from the power source. Always verify the Panel Model number (found on
.rar (This is part 3 of a multi-part archive; you will likely need parts 01 and 02 to successfully extract the full firmware).
