BUEGB is the EEPROM version of the software your ECM is running. BUEGB "For race use only" means they purchased the ECM from the HD dealer that is designed to be used with the factory race muffler. Every ECM will have an EEPROM software version of what they are running. EBR, stock, race, or custom tuned. You have a factory race ECM; not the stock.
Sorry can't help you on Ecmspy. I don't use it.