As 2 days earlier, Apple released the Latest iOS Firmware as iOS 5.1. We have mentioned you all the precautions before update your iDevices on iOS 5.1 because this is risky as you will loose your Jailbreak when you will update to iOS5.1. Whether you have been experiencing battery woes, or you are just pining for an untethered jailbreak, there are a variety of reasons as to why you may wish to downgrade your device from iOS 5.1 back to iOS 5.0.1 or 4.x. Here we are providing you the Procedure for Downgrade iOS 5.1 to iOS 5.0, 5.0.1, iOS 4.3.3, iOS 4.3.5 or earlier. Main point which you should keep in mind is that iPhone 4S will not Downgrade to earlier versions of iOS, unless Apple is signing that particular firmware version to which you’re downgrading to.
Important Note By RedmondPie:
Only the iPhone 4, 3GS, iPad 1 and the iPod touch users can downgrade back to both iOS 5.0.1 (custom firmware only) and iOS 4.x as long as they have SHSH blobs and APTicket saved for the firmware they are downgrading to. iPad 2 users can only downgrade back to iOS 4.x as long as they have saved SHSH blobs for it. You cannot save SHSH blobs once Apple has stopped signing the firmware you want to downgrade to.
How To Downgrade iOS 5.1 To iOS 5.0.1, 5.0, 4.3.5, 4.3.3 On iPhone, iPod Touch & iPad
You have iFaith for downgrading. If you have both APTicket+SHSH blobs saved for iOS 5.0.1 or 5.0, you can downgrade your device to a custom iOS firmware. This procedure will not work for iPhone 4S and iPad 2 but you can downgrade iPhone 4, iPhone 3G, 3Gs, iPad 1 and iPod Touch 3G.
Simply download the latest version of iFaith (below link) for Windows, official stock iOS 5.0.1 firmware from the end of the page.
Build a signed firmware file by clicking on ‘Build *signed* IPSW w/Blobs’.
Browse for the SHSH blobs file that you previously saved for your current device to downgrade back to the old 5.0.1/5.0 firmware. Then, iFaith will ask you to select the stock firmware of which you want it to create custom firmware file from. Once done, iFaith will have a new custom firmware file for you waiting on the desktop with SHSH blobs incorporated for the firmware you are downgrading to.
Next, enter DFU mode using iFaith and then simply use iTunes to restore to this custom firmware file.
For downgrading to iOS 4.3.5 and Earlier
These instructions to iPad 2, iPhone 4, 3GS, iPad 1, and iPod touches with SHSH blobs saved on Cydia or by using TinyUmbrella for the iOS 4.x firmware you are downgrading to. iPhone 4S again is not supported.
Download the iPSW of the firmware version you would like to revert to, as listed below:
- iOS 4.3.5
- iOS 4.3.4
- iOS 4.3.3
Connect your device to your PC or Mac, then slip it into pwned DFU mode using Latest RedSnow (look for Pwned DFU option in “Extras”).
Now, you have to need to edit your hosts file. It can be found in Windows > System 32 > drivers > etc on Windows or just etc on OS X. Back it up somewhere safe, and then open it with a text editor such as Notepad or TextEdit.
Add the following the following string to the bottom of the file, refer to the screenshot for further assistance:
Open iTunes, select your device on the left pane. Hold down Shift (Win) or Alt (OS X), click Restore and locate your elected iOS 4.x iPSW from the first step.
Ignore Error 10xx if it pops up– it’s to be expected. Use TinyUmbrella or Fix Recovery to kick it out of recovery mode.
You have completed your Downgrade. You should have a fresh install of your chosen iOS 4.x firmware version. If you downgraded for purposed of jailbreak, then those of you with an iPhone 4, 3GS, iPad 1, and iPod touches can use Redsn0w or Sn0wbreeze to untether jailbreak on iOS 5.0.1.
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