Unplug the power from your TV or controller board. Insert USB: Plug the drive into the board's USB port.
Use a USB flash drive (ideally 2.0 and 8GB or smaller) and format it to FAT32 . 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. Unplug the power from your TV or controller board