We have a customer in a scn. Site one has a 412 2.1(77). Site two has a 403 2.1(77). Site three has a 406 1.4(25). Site four has a 406 1.4(25). Can anyone tell me if the old 406 control unit can be upgraded to 3.2(57)? I was not sure if this would be a memory issue or not?