Alright guys..so here it is: I stupidly and impulsively just bought an iPhone 4 on craigslist already updated on iOS5 (with 04.11.08 BB). And I've been using ulocked 3GS on T-mobile for a long time now. I'm wondering if restoring with a custom IPSW can downgrade the BB and somehow allow Ultrasn0w to work? The new Redsn0w beta won't let Windows users create a custom, but I just downloaded one online. Is it worth it to go through the hassle of restoring/jailbreaking again for nothing? Or if anyone is aware of alternatives to my problem, I'd appreciate that too.