I've noticed that if you have a character on a VMU that had started with one Dreamcast's specific Access Key & Serial Number, that you can't play on a different Dreamcast with different Access & Serial numbers. However, if the 2 Dreamcasts have the same numbers - you can swap the VMU to either Dreamcast without a problem.
So my questions are; I know that once the numbers are put in, that they save to the DC internally. How do I remove the numbers that are already on system? Alternately, I no longer have the numbers that were used on one system, but I'd like to know what they were. So is there a way to view the Access Key and Serial Number that are already put in? Thanks in advance.