If you aren't having any problems with the ECM programming, a firmware 'update' won't do anything for you. Find a BUEZD fuel map you like, and have at it.
If you are having issues with the AFV re-setting itself to random numbers every time you cycle the key (that was my issue with BUEZD) OR you can't find a BUEZD map, then go by the Harley dealer and hopefully they know what they are doing. Should charge you an hour or less. They install a whole new EEPROM program, which includes the firmware, ECM settings and the .xpr fuel map as well. Once they get it to the BUE2D, you can get whatever map you want easily from Buelltooth.com and others.