If you have upgraded your iPad, iPhone 4, iPhone 3GS or iPod Touch 4G/3G to iOS 4.3 for testing and are facing some issues on this new release or you want to downgrade your iDevice to jailbreakable iOS 4.2.1 or iOS 4.1, here is complete step by step tutorial to downgrade iOS 4.3 to previous iOS versions. This downgrade process for iOS 4.3 is only for those who have saved SHSH Blobs on Cydia servers for iOS 4.2.1 and iOS 4.1.





If you are still on iOS 4.2.1, we highly recommend you to save your blobs before upgrading to iOS 4.3. You can either use TinyUmbrella on Windows and Mac Systems or iSHSHit app on your iPhone.



Requirements :

* iPhone 4, iPhone 3GS,iPad or iPod Touch 4G/3G on iOS 4.3
* Saved SHSH Blobs
* iTunes

Downgrade iOS 4.3 To iOS 4.2.1, iOS 4.1 On Your iDevice [How To] :

1) Download the required IPSW firmware you want to restore on your iDevice.


2) If you are on Windows, Open ”Hosts” file in NotePad from this location : C:/WINDOWS/system32/drivers/etc




If you are on Mac, navigate to GO > Go to Folder and enter the path “/etc” and open the file “hosts” with TextEdit.

3) Now add the following hostname "74.208.105.171 gs.apple.com" at the end of the file. Save the file.



4) Open iTunes and connect your iDevice with your computer via USB cable and put your iDevice into DFU mode. Here is how you can get DFU mode on your iDevice.

* Turn off your iDevice.
* Now press Power button and as soon as you seen Apple Logo, press Home button while keeping pressed Power button too.
* Keep holding down both buttons for about 10 seconds.
* After 10 sec, release Power button but keep holding Home button until iTunes recognizes your iDevice. You should keep the PC volume high to hear New Device Detection sound.
* Go the Home button. At this point your iPhone screen should be blank (black in color).

5) From the iTunes sidebar select your iDevice. Now press the “alt” (option) button on Mac or left “Shift” button if you are on Windows and then click on “Restore” button in iTunes.


This will make iTunes prompt you to select the location for iOS 4.2.1 or iOS4.1 you downloaded in step 1.

Now let iTunes restore iOS 4.2.1 on your iPhone,iPad, or iPod Touch. During the restore process you may see unknown error messages (1013, 1004 etc), ignore these errors.

At this point your iDevice may be stuck in recovery mode, showing “Connect to iTunes”. To get rid of  recovery mode, download TinyUmbrella and click on “Exit Recovery” option.


Now, you have successfully downgraded iOS 4.3 to iOS 4.2.1 or iOS 4.1 on your iDevice.

Download Links :

iTunes 10.1.x
TinyUmbrella