Imagistic 3510/ sharp 350 scan

Question

is there a master product code. we have bough some used imagistics and we know one is capable of scan but it had several copies more than we wanted to resale. we tried trading boards to a lower count machine but does not work. putting boards back on the orginal machine and it won't scan now. we need the product key I think. any ideas
John Wakefield
ACTION OFFICE PRODUCTS