If you are locked out of the system, you can try entering the using these common codes for Menu + 1147 Input/Source + 2580
Firmware for these boards is typically hosted on specialized technician forums like Kenotrontv.ru or provided by sellers on platforms like AliExpress . Preparation: Download all required RAR parts. If you are locked out of the system,
Power on the TV while holding the physical button on the TV frame until the upgrade screen appears. If you are locked out of the system,