cannot unlock 3g iPhone with 3.1.3 and 05.11.07

[stoker]

I've totally messed this up....and praying that someone can help me get out of this jam. I think I somehow (?) jailbroke it because I have Cydia. Now I'm getting a notice that there's no internet connection yet I have Wi-fi and it says it's connected. I'd like to start over from scratch, even to downgrade to 3.1.2 if necessary, but don't know how to do that (I'm on a Mac, BTW). Please please please....help!

[coola]

new blackrain is out...use that to unlock firmware 3.1.3 and bb 5.11.07 only