Disconnect the board from its power source completely.
This method is used when you can access the TV's On-Screen Display (OSD). tvst2903 firmware upgrade
firmware depending on whether the board can currently boot into the menu or if it is stuck in a standby state. Disconnect the board from its power source completely
Turn on the TV, press Menu , and navigate to Settings > System > Software Update (USB) . tvst2903 firmware upgrade
How to update your Smart TV to the latest software - Samsung
The system will scan for the USB. Select Yes or Update when prompted.
Save the firmware file to the root of a FAT32 USB drive.