Press and hold the on the TV panel (not the remote).
Plug the TV back in while continuing to hold the Power button.
: Place the extracted firmware file (usually named allinstall.pkg or similar) directly onto the root of the USB drive. Do not put it in a folder. The Flashing Process : Unplug the TV from the power outlet. Insert the USB drive into the TV's USB port.
Flashing the wrong firmware can "brick" your TV, making it completely unresponsive. Always verify that your board number () and screen resolution ( 1366x768 ) match the software exactly before proceeding.
: You cannot extract the .bin or .img file required for flashing unless every single part is present in the same folder.