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How to Downgrade iOS 4.3.3 to 4.3.2, 4.3.1, 4.3, 4.2.1 on iPhone 4, 3GS, iPad 2, iPad, iPod touch [Tutorial]


If you upgraded to iOS 4.3.3, and now you want to downgrade back to iOS 4.3.2, iOS 4.3.1, iOS 4.3, or iOS 4.2.1, then simply follow the instructions posted below to downgrade iOS 4.3.3 on iPhone 4, 3GS, iPod touch, iPad 2 and iPad 1 to iOS 4.3.2, iOS 4.3.1, iOS 4.3, iOS 4.2.1, and so on.
NOTE: This guide will only work if you have SHSH blobs saved for the respective firmware you downgrading to.


Step 1: Download the required old ipsw firmware files. (Download links: iOS 4.3.2, iOS 4.3.1 ,iOS 4.3, iOS 4.2.1)
Step 2: Put your device into DFU mode (not recovery mode).
  • Connect your iOS device to your computer.
  • Turn it off.
  • Start iTunes.
  • Hold Power and Home buttons together for 10 seconds or so.
  • Release Power button but keep holding the Home button until your computer recognizes a new USB device.
  • iTunes will now recognize your iPhone, iPad or iPod touch.
Note: Your iPhone, iPad or iPod touch screen at this time should be blank (black in color), if not, then you are most likely in Recovery Mode, not DFU mode.
Step 3: Now trick iTunes into thinking that it is watching Apple servers, while in real, we are going to change the address to Saurik’s server. To do this:
  • Navigate to C:\Windows\System32\drivers\etc\ and locate “hosts” file\
Mac OS X users can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder.

  • Open this “hosts” file in Notepad (for Windows) or TextEdit (for Mac OS X) and add this
74.208.105.171 gs.apple.com
line as shown in the screenshot below:
Now simply save this file and you are good to go!
NOTE for Windows 7 and Vista: Start “Notepad” with Administrator privileges by right clicking on “Notepad” app, and click on “Run as Administrator“ option.


NOTE for Mac OS X: Make sure you have full read and write access on your account when you are saving the host file. If it still throws permission error, simply copy the host file to desktop, make the required changes, and then replace it with the original file in “/etc/” directory.
Step 4: Start iTunes, click on your iOS device icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac, or Left “Shift” button if you are on Windows on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.






Now in some cases while restoring to iOS 4.3.2, iOS 4.3.1, iOS 4.3, iOS 4.2.1 or below, iTunes might throw 1013 error at you as shown in the screenshot below. This is normal, just ignore this error as the firmware has already been successfully installed on the device.

Incase of the above mentioned error, your iPhone, iPad or iPod touch will be stuck in Recovery Mode, showing that “Connect to iTunes” screen.


To exit your device from Recovery Mode, download this program called TinyUmbrella (Windows/Mac), and Fix Recovery (Windows/Mac). Run it and the click on “Exit Recovery” button. Your device will now restart normally.



That’s it, you should now be able to jailbreak and unlock your device on the older iOS 4.3.2, iOS 4.3.1, iOS 4.2.1 or iOS 4.1 firmware. You can jailbreak your iPhone, iPad or iPod touch with Redsn0w on iOS 4.2.1 (or untethered with GreenPois0n RC5), or with Limera1n on iOS 4.1, or on iOS 4.3.1 with Redsn0w, PwnageTool 4.3 (untethered | tethered), or with Sn0wbreeze on Windows, or on iOS 4.3.2 with Redsn0w, PwnageTool 4.3 (tethered), or with Sn0wbreeze on Windows if you haven’t already.

CHEERS!


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