Custom .ipsw from trusted source
Hello fellow iPhone-ers!
I switched To the iPhone 3gs this past summer and immediately jailbroke. I used my brothers Mac and downloaded Pwnage tool and the official Apple .ipsw 3.0 and now 3.1. Since then he has moved away and I no longer have access to a Mac. I have a PC at home and at work. My question is, where can I download custom .ipsw that I can trust. I'm looking to upgrade to 3.1.2. *I know that there are a few places out there, but I don't know who I can trust and which are sketchy. My phone is both jailbroken and unlocked and I'm currently on the AT&T network under contract, I have an SHSH on file wth Cydia.
Thanks for the help*