Guys, I'm at a loss. I've been plowing away at this for nearly 10 hours straight, and nothing I try seems to work. I bought an 8GB iPhone 3GS running iOS 4.1. The phone's baseband is 05.15.04. Nothing I do seems to work at upgrading the baseband so that I can unlock the phone (for use on T-Mobile). Whenever I try restoring the OS on iTunes, it falls short, with error 1015. I've downgraded iTunes from 10.2.1 to 10.1.1. I've done a factory reset. I've tried the latest redsn0w. I've tried the two latest builds of Pwnage Tool. I'm running OS X 10.6.6 on an iMac. If I can't get this to work, I'm going to have to ditch the iPhone and go back to my Windows Phone HD7. Does anyone have any clue? Any ideas? Thanks in advance.