MuscleNerd, in tweet, hints that they are working on downgrading Baseband 06.15.00 to 05.13.04. In a reply to one of his followers, Musclenerd confirmed that downgrade of iPad baseband 06.15.00 to 05.13.04 is very much possible and is 99% doable.
Just a few minutes ago iH8sn0w has updated sn0wbreeze to version 2.5 to support the recently released iOS 4.3.1 untether. This update has came after the release of Redsn0w 0.9.6 RC9 and PwnageTool 4.3 for untethered iOS 4.3.1 jailbreak. If your device is on baseband 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04 or 06.15.00. Sn0wbreeze 2.5 lets you update your iPhone 3GS to 06.15.00 baseband for unlocking.
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