Insert the USB into the TV's port while it is off. Turn the power on; the standby light should blink rapidly, indicating the update is in progress.
Ensure you are using the correct firmware for your exact screen resolution (1366x768). Installing the wrong resolution firmware can result in a distorted or black screen. Download MS358 PB801 1366x768 512M USB part3 rar
Usually distributed as multiple .rar parts (e.g., "part3") due to file size. Where to Find the Download Insert the USB into the TV's port while it is off