Continue holding the Power button for about 5 seconds. The indicator light should start flashing rapidly, indicating the update is in progress.
Press and hold the Power button on the TV panel (not the remote). Download LDD M538 A138 3840x2160 Nordmende part01 rar
Known to host LDD.M538.A138-3840x2160 files for various panel types (e.g., HV430QUB). Continue holding the Power button for about 5 seconds
Follow the official Nordmende/Akai update procedure to flash the mainboard: Unplug the TV's power cord from the wall outlet. Insert USB: Plug the flash drive into the TV's USB port. Download LDD M538 A138 3840x2160 Nordmende part01 rar
This specific firmware is often hosted on community-driven technical forums and repositories. You can find the .rar archives on platforms like: