The unofficial iPhone Dev Team has released a new version of redsn0w, its jailbreaking utility for iOS devices. The v0.9.11b4 update lets users restore old IPSW files to A5-based Apple devices, including the iPhone 4S, third-generation iPad, and iPad 2; previously, only devices prior to the iPad 2 could be downgraded, thanks to the limera1n exploit. The update means that A5 devices can now be downgraded from iOS 5.1.1 or 5.1 to 5.0.1.
