How To Downgrade iOS 4.3 To iOS 4.2.1 / 4.1 ( iPhone 4, iPhone 3GS, iPod Touch and iPad Guide )


12.01.2011

How To Downgrade iOS 4.3 To iOS 4.2.1 / 4.1 ( iPhone 4, iPhone 3GS, iPod Touch and iPad Guide )

Apple released iOS 4.3 for almost their iOS devices, such as the iPhone 4, iPhone 3GS, iPod Touch 4G and 3G, iPad and Apple TV. In case you upgraded your iOS 4.2.1 or 4.1 to iOS 4.3 beta and you are not happy with it, then you are in the right place, as this post contains instructions that will help you downgrade from iOS 4.3 to iOS 4.2.1 or 4.1.

This guide is easy to follow, especially if you already performed other downgrades for the previous iOS devices, but you should know that it will work only if you saved the SHSH blobs for the iOS firmware that you wish to downgrade to. Now you can start the downgrade process for iOS 4.3 to 4.2.1 or 4.1.

How To Downgrade From iOS 4.3 To iOS 4.2.1 or 4.1. Guide For iPhone 4, 3GS, iPod Touch, iPad and Apple TV

1st STEP: First thing that you need to do is to download the ipsw firmware files for the iOS version you wish to downgrade to:

  • Click here to download the old ipsw firmware files for iOS 4.2.1

  • Click here to download the old ipsw firmware files for iOS 4.1

  • Click here to download the old ipsw firmware files for iOS 4.0.2

  • Click here to download the old ipsw firmware files for iOS 4.0.1

2nd STEP: Now you have to set your device to DFU mode. Do not mistake DFU mode with ‘recovery mode’, as these two modes are different one from another.

Now that your device is in DFU mode, follow these instructions:

  1. Plug your iOS gadget into your computer.

  2. Shut down the iOS device.

  3. Open iTunes in your computer.

  4. Now you need to hold for approximately 10 seconds the ‘Power’ and ‘Home’ button of your iOS device.

  5. Now let go of the ‘Power’ button, but keep pressing the ‘Home’ button until the PC manages to detect a new USB gadget.

  6. Now iTunes should detect your iOS device and, the touch screen of the device should be black ( blank). In case the touch screen of your iPhone isn’t blank, then it means that you are into Recovery mode, not into DFU mode and you should repeat the steps until you manage to boot your iPhone, iPad or iPod Touch into DFU mode.

  7. If everything is ok go straight to the next part of this iOS 4.3 downgrade guide.

3rd STEP: Now you have to configure the iTunes app, so that it thinks that it is using Apple server, when instead you will change its address to the server of Saurik. Follow the instructions below to learn how to do it:

For Windows users:

  • go to ‘C:WindowsSystem32driversetc’ and find the ‘hosts’ file. Open the ‘hosts file in Notepad with administrator rights and you need to enter the following line : 74.208.105.171 gs.apple.com

For Mac OS X users:

  • go to the ‘/etc/’ folder via ‘Go, then select Go to Folder’ from Finder. Now open the ‘TextEdit’ app and add the following line: 74.208.105.171 gs.apple.com

After you’ve entered that line code into ‘hosts’ file, you need to save the file and that’s it. Get to the next step.

4th STEP: Now you have to run iTunes and select your iOS gadget from the iTunes’ sidebar. If you’re using a Mac OS X computer, you have to press and hold the left ‘alt’ key and after that click ‘Restore’. For Windows PC you have to press and hold the left ‘Shift’ button and then click ‘Restore’. After you click Restore, you can release those buttons. All these actions are done in iTunes.

5th STEP: Now iTunes will ask you to select the location of the firmware files for iOS 4.2.1 or 4.1. Browse to the folder where those files are saved and select the ipsw you want to use. After that click ‘Open’, which will restore the iOS gadget. Now iTunes will do the rest of the work. Please note that this might take a while and you should simply wait until iTunes manages to install the iOS firmware files for your iPhone, iPod Touch or iPad. When the process is done, the device will automatically restart. That’s it.

Also, you should know that iTunes might show the 1013 error and you need ignore it, because all the files have been correctly installed. However, in case your iOS device displays that error, then it will surely remain stuck in ‘Recovery Mode’ with the ‘Connect to iTunes’ desktop displayed. This means that you will have to follow the instructions below in order to get rid of the Connect to iTunes screen:

  • download TinyUmbrella app. Click here for Mac version or click here for Windows version.

  • Run it and then select ‘Exit Recovery’ and your iOS device will boot as it should. Also, you should get rid of the ’74.208.105.171 gs.apple.com’ code line from the ‘hosts’ file and your device will start to show future Apple updates through the iTunes app.

Now that you managed to downgrade your iOS 4.3 to 4.2.1 or 4.1, you can go ahead and jailbreak and unlock your Apple iOS device. Click here or here for a guide on how to do it for iOS 4.2.1.

iPhone 4

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