If you read the change log of the newly released RedSnow Version 0.9.9b9, then you would notice a reference to an update for the UltraSnow unlock tool coming next Monday on Cydia.
From Dev-team blog :

  • Ultrasn0w compatibility update (i.e. same baseband requirements) for 5.0.1 will be available on Cydia Monday.
  • This upcoming Ultrasnow update will allow users to unlock their device without the need of the UltraSnow 5.0.1 fixer.
  • The new update 1.2.5 is not a new unlock for higher basebands.It only brings compatibility with iOS 5.0.1 for already unlockable basebands.

So, the supported basebands are for UltraSnow 1.2.5 are:

  • 01.59.00
  • 04.26.08
  • 05.11.07
  • 05.12.01
  • 05.13.04
  • 06.15.00

You will be able to use ultrasn0w 1.2.5 after jailbreaking your iPhone 4, 3GS via custom firmware using Redsn0w 0.9.9 b9b.


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