Apple has released the iOS 4.3.1 for the iDevices as we reported yesterday. We also brought you the guides for the JB of iOS 4.3.1 using the PwnageTool bundle on the iPhone 4. iPod Touch 4G and iPad. If for some reason you want to downgrade from the installed iOS 4.3.1 to the previous iOS 4.3, iOS 4.2.1 or iOS 4.1 then just follow this step-by-step guide to achieve that.
Note: A word of caution before going any further – please note that this method will only work if you have SHSH blobs saved for the respective firmware you are downgrading to.
So here we go:
Step 1: First you need to download the old .ipsw files to which you want to downgrade to.
Step 2: If you are on Windows open the following folder in Windows explorer “C:\Windows\System32\drivers\etc”
(For the mac users they can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder.)
Step 3: Now look for the file named hosts and load it in the Notepad (or any other text editor of your choice) and mac users should look for TextEdit.
Step 4: After opening this “hosts” file in Notepad (for Windows) or TextEdit (for Mac OS X) and now append the lines:
at the end as shown below:
Finally, save this file.
Step 5: Now you need to plug-in your iPhone in to the PC and put it in to the DFU mode. To do so hold home and power buttons together for 10 seconds after which release power button while keep holding home button for another 10 seconds after which you will enter DFU mode.
Step 6: Now iTunes will inform you that : “iTunes has detected an iPhone in recovery mode. You must restore it before it can be used.” Just click okay here.
Step 7: Now, we need to restore the firmware – Hold down the “SHIFT” key (Windows)/ “ALT” key (Mac) and click on the “Restore“ button.
Step 8:We are almost done! Just wait till iTunes finish installing old firmware on your iDevice.
Note 1: If you get 1013 error, don’t worry about it. This is normal and the firmware is already successfully installed on the device. But you will need to get out of the recovery mode (incase you get this error). For that just download the TinyUmbrella app that will allow you enter and exit out of the recovery mode (Windows/Mac).
To get out of the recovery mode just press “Kick Device Out of Recovery” button on TinyUmbrella right below the Start TSS Server button. Now you are DONE!
Note 2: Don’t forget to remove 188.8.131.52 gs.apple.com text line from the host file (that we added earlier) to revert the changes and save it. It is needed to allow iTunes to prompt you about future updates from Apple.
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