Downgrade iPhone 3G/3GS Baseband From 06.15 to 05.13.04

  If you don’t know what this means or don’t need to unlock your phone than don’t worry about any of this.  Recently, MuscleNerd released a new version of Redsn0w with the capability of downgrading the iPhone’s baseband from 06.15 to 05.13.04. This is particularly good as is both fixs GPS issues and makes your device compatible with Ultrasn0w. Below are the