Press and hold the power button on the TV (not the remote) while plugging it back in.
: Use a FAT32-formatted USB stick. Copy the extracted firmware file directly onto the root of the drive (not inside a folder). Flashing Process : Unplug the TV from power. Insert the USB drive into the TV's service or USB port.
: Refers to the specific TV series (where "xx" is the screen size, like 43, 50, or 55).