Redsn0w 0.9.14b2 coming soon to fix 06.15.00 downgrade issues for some 3Gs users
Ever since we posted the 06.15.00 iPad baseband downgrade tutorial last week, we have received numerous reports from our readers that the baseband was just not downgrading. The process would go through normally and look like it was working, but in the end the baseband would remain on 06.15.00. Yesterday, @MuscleNerd announced that he has figured out why some 3Gs devices have been "refusing" the baseband downgrade. He says that he will be receiving a device to test it on this Thursday in order to address the issue which is apparently due to variations in the NOR chip.
If you've attempted the baseband downgrade a few times and your baseband has remained on 06.15.00, we would suggest waiting until the new release this Thursday which should fix the issue.