Press and on the TV (not the remote).

Identifying your exact hardware variant is necessary before flashing, as using the wrong firmware can permanently damage the device. : 43 inches.

: Copy the extracted firmware file (e.g., upgrade_loader.pkg or similar .bin / .img file) directly to the root directory of the USB. Do not put it in a folder. The "Force Flash" Method : Turn off the TV and unplug it from power. Insert the USB drive into the USB 2.0 port.

Keep holding until the screen shows an "Upgrading" or "Software Updating" progress bar.