While official direct links are often restricted to authorized service centers, you can find the software on dedicated technician forums and community megapacks:
: Release the button once an update progress bar or a blinking LED appears. Do not power off the TV during this process. Maintenance Manual Download RT2851P839 3840x2160 AKAI USB part10 rar
: Place the extracted .bin file directly into the root folder of the USB drive. Initiate Update : Unplug the TV from the power outlet. Insert the USB drive into the TV's USB port. While official direct links are often restricted to