I dont know if this model will let you or not, but try holding down keys 1 & 9 while turning the copier on, keep holding for 5 seconds more, or so then let go. a white block should appear on upper left of screen. If so you are good. After about 40 minutes or more the screen should fill up with white blocks. Then it will say download mode if all worked. This is like a computer defrag and repair. Once its done and says download, turn off and back on and try it and see if it works.