As the Apple yesterday released the iOS 5.1 update globally for the iOS devices on the next-generation iPad media launch event. Like always, the new iOS 5.1 update comes with a lot of security patches, including the fix of the jailbreaking loop hole that allows iOS jailbreak community to make their way into the iOS 5.0.1 on the A5 carrying devices. Without wasting a single moment, the iPhone Dev-Team has just released their important notes regarding the iOS 5.1 because they believe most of the users upgraded to the newer iOS versions accidently whenever they connect their devices to the iTunes.

It is reported that Apple will soon close its iOS 5.0.1 SHSH blobs signing windows, as the iOS 5.1 is just started spreading the world with the massive announcement on the iPad 3 launch event. iPhone Dev-Team has reminded us that the SHSH blobs’ technique for the newer device is not yet discovered, and moreover, Apple has tricked the iOS 5.0 with new skills that prevent them to downgrade any upgraded device to newer version even if you have saved the SHSH blobs. Currently, there is now way to downgrade your device to iOS 5.0 / iOS 5.0.1 if you have upgraded your device to iOS 5.1.


  • Soon after 5.1 appears on Apple’s public servers (i.e. iTunes starts to offer it), Apple will stop signing 5.0.1 SHSH blobs.
  • If you have an iPhone4S, the basic rule above is really the only rule:  you cannot restore back to 5.0.1 once the 5.0.1 signing window is closed, no matter what (even if you saved your SHSH blobs).
  • If you have an iPad2 with saved 4.x hashes, you can in fact downgrade to that 4.x but you won’t be able to get to 5.0.1 once the 5.0.1 signing window is closed (even if you saved your 5.0.1 SHSH blobs).
  • If you have a device earlier than the iPad2, you can downgrade to whatever version you want, as long as you have saved SHSH blobs for that version.  You’ll need the assistance of geohot’s limera1n exploit with tools like redsn0wto get into “pwned DFU mode” and bypass the downgrade restriction.

iPhone Dev-Team has again warned the next-generation device carrying users, especially the users who have the iPad 2 and iPhone 4S because both devices are spotting the A5 processor which is not yet completely exploited by the iOS jailbreaking team, and if the users have played anything with their device, they will surely lose it charms because there is no way to kick out the devices from any loop hole. Our Pro-Tip: Just ignore the iTunes automatic update, and as well as the OTA iOS 5.1 update on your device, because both will upgrade your device iOS version to the latest.