My new GT31 locked up on my last attempt to break world (Lanier) speed record. Scott per your advise I let the battery cycle down and it apprears to have reset 'A-OKAY.'
The chatter on the web indicates that this might be a reoccuring problem especially with units running older firmware (I'm supposed to have the latest firmware).
I have a call into Craig for input and asked him to explain the "Speed Genie" & SD Card when he calls.
I'll post what he says.