I don’t think you need to factory reset this machine. I would start by printing something and see how it runs, see if the z-offset needs adjusting. There are 4 screws, 2 each side of the leadscrew, do not fully tighten these, nip them up tight then back them off 1/2 to a full turn, this float will allow for any leadscrew play.
If you really want to factory reset you can either load new firmware or:-
- Go to the printer’s Control menu
- Select Reset configuration
- Follow the prompts on the screen