Use a stable programmer like the CH341A or RT809F to write the .bin file directly to the flash chip. Thanks in advance for the help! Where to find this file:

If you have the (found on a sticker inside the TV), I can help you narrow down the exact firmware version!

first, even if it's corrupted, to save your unique HDCP keys and MAC address.

If you haven't found a direct link yet, these specialized technician communities often host "rar" archives for this specific board:

: Often contains threads dedicated to the MS3663S series.

mainboard) is a common step for technicians trying to fix "bricked" LED TVs or software loops.