Downgrade iPhone IOS 4.01 to iPhone 3.1.3 OS / 3.1.2 OS

Well, we already know that iPhone IOS 4.01 has been release with some issues fixed, such as Bluetooth Headset and Reception Issue but at speed on which issue and bugs of iPhone IOS 4.01 are reported by iPhone users is dangerous and alarming. From my side, iPhone users should stay away from the iPhone IOS 4.01. but it you have updated on it. You can follow me on Downgrade iPhone IOS 4.01 onto iPhone 3.1.3 OS or to 3.1.2 OS.

The whole procedure is sourced by Crunchitech.com:

I was surfing around i found few blogs, one of those was Crunchitech, who already written a post on the same. So here is his wording.

* so first of all you have to Download the old iPhone OS 3.1.3, iPhone OS 3.1.2 ipsw firmware files.
*now put your Phone or Ipod into DFU mode
*Connect your iPhone to your computer but key in mind that turn iPhone off.
* now Start iTunes and hold Power and Home buttons together for 10 seconds or so.
* Now Release Power button but keep holding the Home button until your computer recognizes a new USB device.

In this way iTunes will now recognize your iPhone.
* so now if you have 3G phone follow this , iPod touch 3G and iPod touch 2G (MC model) which have their SHSH blobs (ECID SHSH) saved on Cydia for the firmware you downgrading on. If you don’t have your SHSH files saved, you cannot downgrade the mentioned devices.

* now Navigate to C:\Windows\System32\drivers\etc\ and locate “hosts” file

Hosts file in Windows

Mac users can get to “/etc/” directory by going through “Go –> Go to Folder” from Finder

Hosts file in OS X

* 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

You will now have to restore your iPhone or iPod touch to the firmware you downloaded in Step 1. Click on your phone icon from the sidebar in iTunes. Now press and hold left “alt” (option) button on Mac (Left “Shift” button 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 the most important step is iTunes prompt you to select the location for your downloaded firmware file. Select that ipsw file and click on “Open”.

* Now wait
keep in mind at some point, iTunes will throw 1011, 1013 or 1015 error at you. This is normal, just ignore this error as the firmware has already been successfully installed on the device.

* Now you will need to exit your device from Recovery Mode.

download a program called RecBoot. Run it and the click on “Exit Recovery Mode” button. Your device will now restart normally.

Download RecBoot for Windows

Download RecBoot for MAC

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