I had an unlocked hactivated 3GS running on t-mobile SIM.
With the redsn0w package, I created a custom IPSW for my phone. I used itunes to restore to this custom IPSW while in DFU mode.
It gave an error saying that your iPhone is not eligible for the upgrade.
It still is in DFU mode.
Please help.
Can I get to iOS5 or go back to 4.3.1?

Thanks a ton!