You can find the firmware for various resolutions, including those near your requirement, through these community sources:
: Wait until the light stops flashing or turns green (usually about 1 minute). Power off the board and remove the USB drive before restarting. Download SK105A 1600X1200 Firmware USB rar
: Detailed guides and potential file links can be found on enthusiast platforms like the EEVblog forum or specialized repair sites like CiklonElectro . USB Flashing Instructions You can find the firmware for various resolutions,