Do you have the (e.g., TP.MT5510S.PB801) from inside the TV to help narrow down the specific firmware file?
often requires matching the motherboard number found inside the TV. Download ONIDA LEO43HG Firmware USB rar
Alternatively, if the TV is still functional, you can check for official over-the-air updates by navigating to > Device Preferences > About > System Update . Do you have the (e
: Press and hold the Power Button on the TV (not the remote) for 5 to 7 seconds until the front LED begins to blink. Do you have the (e.g.
: The update will start automatically. Do not switch off or unplug the TV during this process, which typically takes 3 to 7 minutes.