You can find the firmware for various resolutions, including those near your requirement, through these community sources:
: This site provides a general firmware bundle for the board series. If a standard upgrade fails, they suggest using a forced upgrade name like "UTS6710_sos" for the .bin file inside the archive. Download SK105A 1600X1200 Firmware USB rar
: Insert the USB into the board's USB port while the power is off . You can find the firmware for various resolutions,
: Use a USB drive (preferably small capacity) formatted to FAT32 . including those near your requirement
: Place the correct .bin file (e.g., UTS6710_03F_100.bin ) into the root directory of the USB drive. Do not put it in a folder.
