To update your (1920x1080) firmware using split .rar files (like "part2.rar"), you must first reconstruct the original software file before your TV can recognize it. Step 1: Prepare the Firmware File
Continue holding until the LED light flashes rapidly or an "Upgrading" progress bar appears on the screen.
: Move the extracted firmware file directly to the root directory (not inside any folders) of the USB drive. Step 3: Flash the Firmware
Press and on the TV (not the remote). While holding the button, plug the TV back in .
: Do not turn off the power. The TV will restart automatically once the update is complete, which typically takes about 4 minutes.