You can find the firmware files on technician community forums like the Lab-One Forum , which provides direct links to the bin files and USB software.
Place the extracted .bin file directly into the root directory of your USB drive (do not put it inside a folder). Flashing Process: Turn off the TV power from the main switch. Insert the USB drive into the TV's USB port. Download M338 801 1366x768 India USB part1 rar
Once the blinking stops or the TV restarts, remove the USB drive. You can find the firmware files on technician
Press and hold the on the TV panel (not the remote). Switch on the power while continuing to hold the button. Download M338 801 1366x768 India USB part1 rar