I see. Last time I checked, and unfortunately I'd have to find it to be sure, but at some point BMW changed the SIB number of the nav updates. I thought it was rather recent, like 2 or 3 updates ago, but maybe it was earlier. I just thought that maybe you saw the v31 SIB that's all. Chances are you're right and v31 is the same SIB as V30 was, however just keep in mind that it MIGHT be different.