MuscleNerd, hacker for iPhone Dev Team, has announced via twitter that he has made great progress on the 3G/3GS 6.15.00 baseband downgrade. This means that any user who upgraded to 6.15.00 for the unlock, can downgrade back to 5.13.04, which will allow for both an unlock via ultrasn0w and get your GPS working again.
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Made great progress yesterday on downgrade from BB 06.15 (for 3G/3GS owners who got officially unlocked). All the pieces are there