Because this is a "dump" rather than a standard USB update, you cannot install it via the TV's menu. It requires physical intervention:
You can find the firmware file hosted on several specialized technician forums and file-sharing platforms:
Open the TV casing and locate the 8-pin Winbond 25Q32 chip on the 35022917 mainboard.
Use your programmer to read and save the current (corrupted) firmware from the chip. This is a vital safety step.
