People have pretty much answered your question, but I have to ask, what are you experiencing that would require a firmware update?How come there has been no firmware updates bc125at or bcd325p2 since the passing of Paul???
So for instance had bc125at with firmware of 1.05.01 and it's not listed at all.
The only reason I got this scanner,was for railroad and aviation. I do have bcd325p2,rarely is used.Although a very good analog scanner, it does not have the complexity of newer digital models and works as intended. I have both Uniden and Whistler (GRE) scanners, and none of the older models have had any updates. Planned obsolescence is how new items get sold and companies keep making money.