Flashing this board is generally done via a USB stick. The .rar file must be extracted to reveal a .bin file (often named MS3663T_S.bin or similar). Use a USB 2.0 drive formatted to FAT32 .
Place the extracted .bin file in the root directory (not inside any folder). Execute the Flash: Insert the USB into the powered-off TV. Download MS3663T PB757 1366x768 TELEFUNKEN rar
Because these files are usually hosted on specialized technician forums or community repositories rather than official brand sites, you can typically find them on: Flashing this board is generally done via a USB stick