I suggest that you call into our support department for assistance @ 1-800-835-6100 they can assist you with resetting the printer.
It should be quite simple if the firmware is up to date.
Login as admin and go to Machine Status > Tools > Device Settings > General > Erase Customer Data
Is there any way to ket us reset our WorkCentre 3655X MFP to factory mode? We couldn't find any option to do this?