Would you buy a used zumo 550 if the current owner dosnt have the cd or unlock code for cd?? I have a zumo550 and all the codes and software... I was looking for a second unit.. a friend of mine is wanting to get the latest and greatest from garmin and will sell me his 550.. but no software no code... i cant think of any reason i would need his lost copy............. can you... am i missing something?? i also recently purchased maps update from garmin... can i update two unit on the same subscription??