A friend of mine is using an unlocked iPhone 3G and asked me to update her iPhone software to the newest version. The phone is currently running 3.0.1. So I grabbed Pwnagetool and downloaded the 3.1.3 IPSW file. Connected her iPhone, started up Pwnagetool and when I got to the step asking for the IPSW, I selected the 3.1.3 file and then got a message from Pwnagetool saying "incorrect firmware selected" or something along those lines. Thinking that it might have to do with the file I downloaded, I grabbed a 3.1.2 IPSW (got them all from iclarified.com). I repeated the process--and got the same result. What's up with this? What's incorrect about the IPSW's I tried?