You can find the firmware for various resolutions, including those near your requirement, through these community sources:
: 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 Download SK105A 1600X1200 Firmware USB rar
Do not disconnect power during the flashing process, as this can permanently "brick" the controller board. , such as the .03 or .A8 variant? You can find the firmware for various resolutions,