LCD driver board M.NT68676.2 issue: Screen compressed, fills only part of display
Try to reflash exact resolution firmware by rt809f programmer. I also got 1280x800 board resolution but I needed 1200x800 as per my LCD. So my picture was slightly bigger with height of same as of screen but width was slightly bigger.so some portion were cutting. In your case low resolution firmware may have burned.just download the firmware file of your board and flash it either hex or bin file. You will be good to go