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 says that they are working on downgrade iPhone 3GS baseband 06.15.00 to 05.13.04 rather than an unlock for baseband 06.15.02, 05.14.02, or 05.15.04.
Someone asked MuscleNerd in a tweet; “what about people with 3GS firmware 4.3.1 and baseband 5.16.02? How long do we have to wait to unlock our devices 
i hope soon”. MuscleNerd responded in two tweets:
for those at 05.14, 05.15 or 05.16 I really don’t see an unlock coming. Rather, it’ll be: update to 06.15, then down to 05.13
(because the downgrade from 06.15 goal is much higher priority than explicit 05.14,05.15, or 05.16 unlock. Achieves same.)
So the idea is, there won’t be an unlock for iPhone 3GS baseband 05.16.02, 05.14.02, or 05.15.04.Rather, dev-team is working on a method by following which, users with iPhone baseband 05.16.02, 05.14.02, or 05.15.04 will update their baseband to iPad baseband 06.15.00 and then downgrade baseband 06.15.00 to an iPhone unlockable baseband 05.13.04.
We’ll update you as we know more on this baseband downgrade hack. Stay Tuned!
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