Many of Apple iPhone users asked for guidelines to downgrade their iPhone 4, iPhone 3GS running iOS 4.0.2 to iOS 4.0.1 / 4.0 / 3.1.3 / 3.1.2. Well, for Apple users those are running iOS 4.0.2 /4.0 /3.1.3 as follows, i want to tell them again that, they shouldn’t update their firmware to iOS 4.0.2. Although there jailbreak is possible for iOS 4.0.2 iPhone 3GS / 3G / iPod Touch in an unofficial way. But till the time it is suggested that, do not update your firmware to iOS 4.0.2 untill an official jailbreak process or tool is released. After all the firmware iOS 4.0.2is come only with a patch on existing jailbroken iOS 4.0.1 setup using PDF Patch from Cydia.
But if you accidentally update your iphone to iOS 4.0.2 firmware then, you may jailbreak your iPhone by following our articles (iPhone 3GS Jailbreak on iOS 4.0.2 with PwnageTool, iPhone 3G / iPod touch 2G Jailbreak on iOS 4.0.2 with Redsn0w).
Or, if you don’t want to jailbreak but want your old firmware into your iPhone then simple follow the steps listed bellow.
1. Download required old ipsw firmware files from table below
| iOS 4.0.1 | iOS 4 | iOS 3.1.3 | iOS 3.1.2 |
| iPhone 4 | iPhone 4 | iPhone 2G | iPhone 2G |
| iPhone 3GS | iPhone 3GS | iPhone 3G | iPhone 3G |
| iPhone 3G | iPhone 3G | iPhone 3GS | iPhone 3GS |
| iPod touch 2G | |||
| iPod touch 3G |
2. Put your device into DFU mode but not in recovery mode
- Connect your iPhone to your PC
- Turn your iPhone off
- Start iTunes
- Hold Power and Home buttons simultaneously for 10 seconds
- Release Power button but keep holding the Home button until your computer recognizes a new USB device
- And now iTunes will recognize your iPhone
NOTE: In DFU mode your iPhone screen should be in black color, if not then most likely you are in Recovery Mode.
(Step 3 is for iPhone 4, iPhone 3GS, iPod touch 3G and 2G (MC Model) users only. If you are on iPhone 3G or iPod touch 2G (non-MC model), skip Step 3 and continue from Step 4)
3. This step is for those iPhones (which are Quoted above) have their SHSH blobs (ECID SHSH) saved on Cydia for the firmware you download. If you don’t have saved SHSH files, you can’t downgrade your devices.
Well, follow the steps -
- 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.
- And open this “hosts” file in Notepad (for Windows) or TextEdit (for Mac OS X) and add code Quoted and put it to the line as shown in the screenshot below:
74.208.105.171 gs.apple.com
Now simply save this file.4. Now you will 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
- Then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release this button.
Now iTunes is prompt you to select the location for your downloaded firmware file. Select that ipsw file and click “Open”.
5. Now simply sit back, iTunes will reset your iPhone automatically. during the process iTunes will throw “1011″, “1013″ or “1015″ error at you. But just ignore it, as the firmware has already been successfully installed on the device.
6. Now to exit your device from Recovery Mode – download a program called RecBoot. Run it and click on “Exit Recovery Mode” button. It will restart your iPhone normally. and then you can see your previous or downloaded firmware on your iPhone.
That’s all you may now free to jailbreak and unlock your device for respective firmware.[via]
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