Official firmware is often found on manufacturer support pages like Smart-Tech TV Downloads by entering your specific model name. For generic boards, technicians often use community forums or specialized firmware databases. How to update the firmware / Software on a Samsung TV
Release the button when the front LED starts blinking rapidly or an "Upgrading" progress bar appears on the screen. Download RT2861P839 3840x2160 Clever55 part4 rar
Copy the extracted firmware file directly to the of the USB drive (do not put it inside a folder). Installation Procedure Official firmware is often found on manufacturer support