: Plug your prepared USB drive into the TV's USB 2.0 port.

: Press and hold the Power button on the TV cabinet (not the remote). While holding the button, plug the TV back into the power outlet.

: Use a tool like WinRAR or 7-Zip. Right-click part01.rar and select "Extract Here." This will combine all parts into the final firmware file, usually named all_upgrade_v551.bin or similar.