Redsn0w 0.9.14b1. How to downgrade 6.15.00 Baseband On iPhone 3GS/3G with Redsn0w 0.9.14b1. iPhone Dev Team has release Redsn0w 0.9.14b1 to Downgrade 6.15.00 Baseband On iPhone 3GS/3G. In 2010 iPhone Dev team was released way to unlock their iPhone 3GS by upgrading the baseband to 06.15.00 but that caused GPS issues and it was also not possible to downgrade the baseband before today’s release Redsn0w 0.9.14b1 More »