mainboard . Reinstalling the firmware can breathe new life into your 4K Ultra HD display. Why You Might Need This Update

Release the button once you see an "Upgrading" or "Software Updating" progress bar on the screen. Do not turn off the power during this time, as it could permanently damage the mainboard.

The TV powers on but never reaches the home screen. System Lag: Smart features and apps are slow to respond.

The correct (often labeled as MS638_PC822_Aconatic_49DSU800_part1.rar ). WinRAR or 7-Zip to extract the .rar package. Step-by-Step Installation Guide