iPhone 4, iOS5 Unlock

[UrBoyTim]

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.

 

[hytl]

I'm sorry but you can't. Alternative solution would be switch your carrier to h2o wireless that people are talking about on this topic https://forums.macrumors.com/threads/1063840/

 

[Eternal 28]

If Apple is still signing iOS 4.3.5 you can downgrade your phone to 4.3.5 and your baseband will be downgraded as well. Thats what did last week. Good luck

 

[Crystal-RX]

If Apple is still signing iOS 4.3.5 you can downgrade your phone to 4.3.5 and your baseband will be downgraded as well. Thats what did last week. Good luck

Apple stopped signing 4.3.5 more than 2 weeks ago.

 

[UrBoyTim]

Yea I was bummed when I found out that Apple stopped signing 4.3.5.
Oh well, thanks for the responses! And I think I might just wait until they can unlock the new bb instead of switching carriers. I think I can just use my old t-mobile phone until then.
Thanks guys!