If you want, I can:

→ Provide your exact TV model number (on sticker on back of TV). Once you share that, I can locate the correct official firmware with the built-in recovery.

Disconnect , including HDMI inputs, soundbars, satellite coaxial leads, and Ethernet cords.

Direct you to the precise if you can tell me the exact model.

Reconnect only the main power cable to the wall and switch the TV on. Step 2: Attempt a Manual Factory Reinstallation