Following the release of iOS 5.1.1 a few days ago, iPhone Dev-Team leader and iOS hacker MuscleNerd has tweeted about an upcoming update to the redsn0w jailbreaking utility that will include support for restoring, including downgrading the iOS version of your iPhone 4S, iPad 2, or new iPad. The update will also include stitching on the fly.
Those with an iPhone 4S, iPad 2, or new iPad will need to have the SHSH blobs saved for the desired iOS version that they wish to downgrade to. That means anyone who purchases one of these A5-powered devices with iOS 5.1 or 5.1.1 pre-installed will not be able to downgrade to iOS 5.0.1 or earlier.
While iOS hacker pod2g is working on a jailbreak for these devices, which he may hold off on releasing until the launch of iOS 6, downgrading your device could be a viable option if you wish to use the iOS 5.0.1 untethered jailbreak.
Jailbreaking allows you to install third-party applications, tweaks, mods, themes, useful utilities, and other content—called “packages”—from Cydia, the jailbreak equivalent of the App Store on iOS. Jailbreaking essentially allows for you to further customize and enhance your iPhone, iPod touch, or iPad beyond the limits that Apple imposes.