Once you have the .rar file, follow these general steps to update the board:

: Format a small USB flash drive (ideally 4GB or less) to FAT32 .

FIrmware Update on new board - Official Sony Electronics Community

: Technicians often share these files on platforms like Telegram channels dedicated to LCD/LED software .

until the flashing stops or the light stays solid. Restart : Remove the USB drive and restart the TV.