MuscleNerd of iPhone dev-team has leaked some updates regarding iPhone 3GS basebanddowngrade, which will help users who stuck on baseband 5.14.02, 5.15.04 and 5.16.00 toupgrade to 6.15.00 then downgrade to 5.13.04 baseband which is already can be unlocked with the existing version of Ultrasn0w.
It will also fix your GPS issue.. this is the only method that will work for your 3GS.
please see this post if you need to know how to update your basedband to 6.15.00
Upgrade baseband to 6.15.00
Hurray…
It will also fix your GPS issue.. this is the only method that will work for your 3GS.
please see this post if you need to know how to update your basedband to 6.15.00
Upgrade baseband to 6.15.00
Hurray…
Iphone-god for all your iPhone needs! 
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