Hey,
Your accelerator is talked about
here (scroll down to Twelve Gauge (Derringer 1250))
The R1 looks like it is the firmware version 1 - it doesn't list an updated firmware version but you might be able to make some sense of it if you have some low level programming skills :-)
Interestingly, elsewhere on this page there is the issue you have already mentioned about removing memory listed against another card so seems like it was a pretty standard issue as the others have mentioned.
Rude!