Downgrade iOS 5.1 to iOS 5.0.1 on iPad 2, iPad 3 & iPhone 4S Will be Possible Now

Until iOS iOS 3.x days it was possible to restore any iOS firmware on any iOS device without Apple enforcing you to restore only latest and approved firmware, this helped many to retain their jailbreak in case of accidentally updating to latest un-jailbroken firmware. But starting from iOS 4.x Apple started adding SHSH blob check to make restoring to old firmware impossible their by restricting users from jailbreak their device.

But thanks to genius iPhone hackers, the workaround to restore old firmware using APK reply attack was quickly found and till 5.x release it was possible to restore old firmware for using SHSH blobs saved on Cydia server or using TinyUmbrella tool.

Unfortunately this trick was put to an end with 5.x release where Apple has significantly changed the process of firmware signing and the role of APKTicket. Unlike earlier where your device ECID and firmware version was used to generate APKTicket, which is now changed and uses random string making it impossible to use APKTicket replay attack and impossible to downgrade.

But here is good news, iH8sn0w, iPhone hacker and developer of Sn0wbreeze jailbreak tool has found a loophole in Apple’s apticket system, making it possible to downgrade iOS 5.1 to 5.0 or 5.0.1 or even older firmware. As per iH8sn0w, this works on all A5 devices and will also work on A5X i.e New iPad, once Apple pushes a new firmware for it.

Using this loophole Ih8sn0w has successfully managed to downgrade iPad 2 to 5.0.1 from 5.1. We hope soon we will have working procedure or tool to downgrade iOS 5.1 to older firmware.

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Reader Comments

Just waiting for Jailbreak for the new ipad

Written By toni141
on March 30th, 2012

Liar i tried to restore my iphone 4s back to 5.0.1 and it failed

Written By Stephen
on April 3rd, 2012