For a visual walkthrough of the programming process using a bootable pen drive, watch this detailed tutorial:
Android mainboard firmware (1366x768 resolution, 512MB RAM). This process is typically used by technicians to fix "stuck on logo" issues, boot loops, or software glitches on Smart TVs using this universal board. Download MS338 PB802 1366x768 512M REF64 part1 rar
Press and hold the Power button on the TV's physical keypad (not the remote). For a visual walkthrough of the programming process