Extract the downloaded .rar file and copy the .bin firmware file directly to the root directory of the USB drive (do not put it in a folder).
Ensure the firmware matches your specific panel voltage (3.3V, 5V, or 12V) to avoid damaging the hardware. USB Bridge Firmware updates - tubbutec Download 3663LUA A81 1280x768 Firmware USB rar
You can download the firmware for the (often used with various LED/LCD TV universal boards) from technical communities like Kenotrontv . For a visual guide on the process, some users refer to Tutorial Videos that demonstrate flashing this specific board model. Firmware Details for 1280x768 Board Model: DS.D3663LUA.A8-1-A (also known as LUA63A81). Resolution: 1280x768. Extract the downloaded