Plug the power back in. The indicator light (if available) should begin flashing rapidly, indicating the update is in progress.
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. Download 3663LUA A81 1280x768 Firmware USB rar
Once the light stops flashing or changes color, unplug the USB drive and restart the device. Plug the power back in
Usually provided as a .bin file inside a .rar or .zip archive. How to Install via USB For a visual guide on the process, some
Ensure the firmware matches your specific panel voltage (3.3V, 5V, or 12V) to avoid damaging the hardware. USB Bridge Firmware updates - tubbutec