Press and hold the on the TV panel (not the remote) and plug in the power cord.

The indicator light (LED) should start flashing, indicating the update is in progress.

Firmware is tied to the specific LCD/LED panel model (e.g., V390HJ1). Installing the wrong version can cause an upside-down image, incorrect colors, or a "black screen" bricked state.

Rename the file to SIS231.bin (or as specified by the manufacturer) and place it in the of the USB. Updating: Turn off the TV power. Insert the USB drive into the TV's USB port.

Ensure you download from a reputable technical forum like Elektrotanya or dedicated TV repair communities to avoid malware.