Apple yesterday had released the iOS 5.1 with much anticipated features and bug fixes. However the members of the iPhone Dev Team have earlier warned not to upgrade to the iOS 5.1 if they wish to maintain their Untethered jailbreak. While there is still Semi-Tethered Jailbreak available for the iOS 5.1 for only A4 devices but still its not Untethered and many users are also reporting battery woes about their device.
In order to downgrade to any lower firmware yo need to have the SHSH blob saved for it. The Cydia homepage will notify you which SHSH blobs you have saved for your device. iPhone 4S users will unfortunately not be able to downgrade to any lower vesrsion if Apple has stopped signing it like the iOS 5.0.1. iPhone 4 /3S, iPad 1 and iPod Touch users can downgrade to both iOS 5.0.1 (custom firmware only) and iOS 4.x as long as they have SHSH blobs and APTicket saved. The iPad 2 users can only downgrade back to iOS 4.x as long as they have saved SHSH blobs for it.
You cannot get the SHSH blob for any firmware once Apple has stopped signing it.
The steps for the downgrade depends upon the firmware you wish to go to. The method to downgrade to iOS 5.0.1 /5.0 is different than that of iOS 4.3.5 and below.
How To Downgrade iOS 5.1 To iOS 5.0.1 / 5.0 :
Only iPhone 4, 3GS, iPad 1, and iPod touch users can downgrade to iOS 5.x custom firmware using this method and that too if you have the APTicket+SHSH blobs saved for iOS 5.0.1 or 5.0.
The files you would need for the process are iFaith which you can download for Windows from here and official stock iOS 5.0.1 firmware.
Here are the official download links to iOS 5.0.1:
So now that we have the pre requisites, lets start the process :
Step 1 : Launch iFaith and click on ‘Build *signed* IPSW w/Blobs’
Step 2 : Browse and select the SHSH blob you had saved for your iDevice.
Step 3 : Now iFaith will ask you to select the custom firmware for which you want it to create custom firmware file from. Once done the iFaith tool will create a custom firmware file with SHSH blob incorporated and save it on your desktop.
Step 4 : Now enter into the DFU mode of your device. For more information on how to enter into DFU mode click here. Now just launch iTunes an restore your device custom firmware.
That’s it !!! Now you can enjoy iOS 5.0.1 or iOS 5.0 on your device and the Untethered jailbreak for it.
How To Downgrade iOS 5.1 To iOS 4.3.3 / 4.3.5 :
You can follow this method to downgrade to iOS 4.3.5 or below in your iPad 2, iPhone 4, 3GS, iPad 1, and iPod touches with SHSH blobs saved on Cydia. You can also use TinyUmbrella for the iOS 4.x firmware you are downgrading to. The iPhone 4S is not supported by this method.
You need to download the iPSW firmware to which you wish to downgrade to. Also you need to have the latest version of Redsn0w which you can download from here. Now that you have all the files lets begin the process.
Step 1 : Connect your iDevice to your Mac or Windows PC and launch Redsn0w. Go to the Extras and click on pwned DFU mode.
Step 2 : Now you need to edit your Host files which you can find in Windows > System 32 > drivers > etc on Windows or just etc on OS X. You should create a back-up copy and open the file in NotePad or any Text editor.
Step 3 : Add the following line to the bottom of the text file :
Step 4 : Now launch iTunes and select your device which you can find on the left pane and Hold down Shift (Win) or Alt (OS X), click Restore and locate your elected iOS 4.x iPSW which you have downloaded.
Step 5 : Ignore any Error 10xx and use TinyUmbrella or Fix Recovery to get it out of recovery mode.
That’s it !!! Once the process is complete you should have your device downgraded to the desired custom firmware.
For a step by step tutorial on How to Jailbreak your iPhone 4S and iPad 2 Untethered using the Absinthe click here.
For more information on how to Jailbreak your A4 device using Corona or redsn0w click here.
- How To Downgrade iOS 5.0.1 / iOS 5.1 To iOS 5 Firmware Using iFaith [Tutorial]
- How To Downgrade iOS 5.0.1 To iOS 4.3.3 For iPhone 4, 3GS, iPad 2/1[Tutorial]
- Jailbreak iOS 5.1 iPhone, iPad, iPod touch Semi UnTethered Using Redsn0w 0.9.10b6 [How to Tutorial]
- How To Downgrade iOS 5.1 Firmware And Save iOS 5 SHSH Blobs [iSHSHit]
- How To Jailbreak iOS 5 On iPhone 4, 3GS, iPad, iPod Touch With Redsn0w 0.9.8 [Tutorial]