Guide: How To Downgrade from iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, iPhone 3GS, iPod Touch, iPad

A few hours ago Apple Released the Latest iOS 4.3.1 for iPhone, iPod Touch and iPad. This new iOS has got some Minor Bugs fixes, but there are users who've updated their devices to iOS 4.3.1 and can't find a way to downgrade. So this Guide Here will be Helpful for you to downgrade your iPhone 4, iPhone 3GS, iPod Touch, iPad 1 and iPad 2 from iOS 4.3.1 to 4.3, 4.2.1, 4.1 to 4.0.x. Just simply follow our steps below:

NOTE: This guide will only work if you have SHSH blobs saved for the respective firmware you downgrading to.

How To Downgrade from iOS 4.3.1 to 4.3, 4.2.1, 4.1 on iPhone 4, iPhone 3GS, iPod Touch, iPad:

Step 1: First of all you need to download your respective IPSW File(Firmware) which you want to downgrade. Get them Here.

Step 2: Now, let's start the Downgrade, First put your Device into DFU Mode, here's how to:

1. Connect your iOS device to your computer.
2. Turn it off.
3. Start iTunes.
4. Hold Power and Home buttons together for 10 seconds or so.
5. Release Power button but keep holding the Home button until your computer recognizes a new USB device.
6. 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 the Interesting Part, we have to trick iTunes so that it thinks that it is connected to Apple Servers, but in reality we'll connetc it to Saurik server to downgrade, here is how to:

Go to: C:\Windows\System32\drivers\etc\

And then locate "Hosts" File [For Windows]

[For Mac Users] Mac OS X users can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder. 

Step 4: Now after you've located, just open it with "NotePad" (In Windows) and in MAC OS you can open it with "TextEdit", after opening just add this at the end:

74.208.105.171 gs.apple.com

After Done, save this File.

NOTE: for Windows 7 and Vista: Start “Notepad” with Administrator privileges by right clicking on “Notepad” app, and click on “Run as Administrator“ option.Select the Desired firmware which you want to downgrade and then click "Open".

Step 5: Now 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.

Step 6:  Now you'll be prompted to select your IPSw File(Firmware),

It's Almost done Now, iTunes will automatically install your desired OS, as you'll be able to see the progress bar on your Device screen, After Done it will automatically Reboot.

Error TroubleShooting:

Error: If you get 10XX errors, you don’t have to worry. Your restore might have successfully completed. But you need to get your iPhone out the recovery mode. So, to do that – Just download TinyUmbrella app that will help you enter and exit out of the recovery mode (Windows / Mac).

To kick out your device from recovery mode just hit the “Kick Device Out of Recovery” button on TinyUmbrella right below the Start TSS Server button or you can also use RecBoot. That’s it!

Note: You must now remove 74.208.105.171 gs.apple.com line from the host file and save it. Doing this will let iTunes to prompt you about future updates from Apple.

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