Ok it would be better if you did your own research on the net as there is a lot of info on hacking your GT3B as I won't remember everything, but basically to mention a couple the GT3B suffered with some expo issue's, the firmware hack resolves this problem, it has a annoying beep which starts once your battery voltage goes down to 9.0V, the firmware hack can lower the volts plus you can switch off the beep, you can also customize the buttons so there are a lot of benefits plus more.