Asking to activate device after using for years with no issues??? I have a carminat tomtom live buil

Can't activate my uk and irl map, been using for years with no problem, switched engine on yesterday and said I need to activate device??? Can anybody help please I've been trying to figure out on tomtom website, downloaded tomtom home and connect and still no joy ? I don't have serial number or activation code as I brought used and info wasn't given