Place the extracted .pkg or .bin file directly in the root of the USB (not inside any folders).
If your TV is not 4K (3840x2160), this specific firmware will result in a distorted image or a black screen. Download MT5522S PC822 3840x2160 AKTV4636S part03 rar
Open only Part 01 with a tool like WinRAR or 7-Zip ; it will automatically pull data from Part 03 to rebuild the full firmware file. Place the extracted
Plug the TV into the power outlet while still holding the button. Download MT5522S PC822 3840x2160 AKTV4636S part03 rar
Installing incorrect firmware can permanently "brick" your TV. Ensure your board and panel match exactly before proceeding.