: Many AliExpress vendors provide the firmware via email or link upon request after purchase.

: Look for specific "Bin" or "USB firmware" files for the 3663LUA.A81 (sometimes listed as T.R85.A81 or DS.D3663LUA.A81 ) on technical forums like the Lab-One Forum , which hosts various resolutions including 1680x1050 .

: Use a standard USB flash drive and format it to FAT32 .

: The file you need inside the .rar or .zip archive should be named 3463GU_A.bin or similar to be recognized by the board. 2. Prepare the USB Drive

: Extract the firmware file from the downloaded archive. Copy the .bin file directly to the root directory of the USB drive (do not put it in a folder). 3. Installation Steps