Developer Achieves A Way To Downgrade iOS 5.1 To iOS 5.0.1 On iPad 2 And iPhone 4S
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Well known iH8sn0w, an iOS developer and researcher who is all responsible for the production of Sn0wbreeze, iFaith, iReb and F0recast was been working hard to achieve the target by resolving an issue that has been worrying the owners of the iPhone 4S and iPad 2. The said two Apple devices are powered by the A5 processor, gets jailbreak, but doesn’t previously been possible to perform firmware downgrades on those device units yet. Recently when Apple releases a new version of iOS, they simply stopped signing the older firmware, which means any official restores result in the user installing the latest official iOS version onto their device.
With this amazing news surfaced for the 4S and 2nd-gen iPad users who may have accidentally upgraded their jailbroken iOS devices to iOS 5.1 firmware, now can be downgraded soon as well.
Normally, updating to the latest version of iOS isn’t really a big issue for standard users. But, here’s where the problem really occurs when iDevice owners wh wish to perform a jailbreak update their software, leaving them having to sit and wait patiently until the Dev-Teams produce a working, distributable jailbreak for that new iOS version. Users can benefit on older devices, by performing a firmware downgrades to versions of iOS that Apple no longer signs as long as they have saved relevant SHSH Blobs for that firmware. In several cases, Cydia automatically captures any available blobs and update the users’ Cydia app with the blobs that have been saved. Many jailbreak fans uses the TinyUmrella tool to quickly and effectively capture available SHSH blobs and save them locally on their machines for use at a later date.
I am an old iPhone 4 user, and i was new to perform downgrade iOS firmware to older ones, with the help of iFaith i had successfully done downgrading iOS 5.1 to 5.0.1. When comes downgrading iPad 2 and iPhone 4S, it was a bit impossible till now. Canadian based iOS developer and hacker iH8sn0w claims to have found a loophole in Apple’s APTicket system that allowed him to successfully downgrade his iPad 2 from iOS 5.1 to 5.0.1.
We are seeing the iPad 2 since March 2011, and the iPhone 4S since October, there hasn’t been a method available to allow users to downgrade these A5 powered devices which means that a restore is required for any reason that the latest firmware version would be installed. the legendary hacker also believe that the loophole he has found will also allow firmware downgrades on Apple’s new iPad running on the new A5X processor. But, this will only be possible when newer firmwares become available due to the fact that all new iPads were actually shipped with iOS 5.1, which is the current version.
From his Tweet:
Found a loophole in Apple’s apticket system. Restored my iPad 2 to 5.0.1 from 5.1. Works on all A5 devices. 
A5X devices will work too once Apple pushes a new firmware for it.
BTW, This cannot be applied to basebands. Only iOS itself.
So, it is currently possible to downgrade iPhone 3GS, iPhone 4, iPad 1, iPod touch 4G and iPod touch 3G from iOS 5.1 to iOS 5.0.1 using the SHSH blobs saved using TinyUmbrella or TinyCFW.
With this latest iteration, means that the iPhone 4S and iPad 2, which are powered by A5 chip and in the future the new iPad, which is powered by Apple’s A5X chip can be downgraded to the previous firmware versions as well. So, users will be able to downgrade to iOS 5.0.1 and enjoy the untethered jailbreak until the jailbreak for iOS 5.1 is released (Update on iOS 5.1 jailbreak available here).
The news basically means that owners of the iPad 2, the new iPad and the iPhone 4S have finally been invited to the downgrade party and will be able to restore their devices to any firmware of their choice, providing that they have the relevant SHSH blobs saved.
We have no additional information from the developer, stay tuned to Grabi so that we can update if any downgrading iOS 5.1 to older version is possible in another way.
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