How to: Downgrade iOS 4 to 3.1.3 / 3.1.2 on iPhone and iPod Touch

Many of iPhone and iPod Touch users has updated to iOS 4 to see the best iOS features as Multitasking, Wallpapers, and etc.. But they couldn’t jailbreak, they got performance lags, or just didn’t find it suitable. So here’s a new and easy way to Downgrade iOS 4 to 3.1.3 / 3.1.2 or older on both iPhone and iPod Touch.

Note:
For iPhone 3GS, iPod Touch 3G and iPod Touch 2G (MC) you MUST have SHSH blobs of the older Firmware, if your SHSH Blobs are saved on saurik’s server then follow this steps to get it on your computer:
Step 1: Connect your Device and Launch TinyUmbrella (Download below) then Check on “Advanced Options
Step 2: Now select your Device, Firmware and Location (Choose Cydia)
Step 3: Click on “Save My SHSH” button

Required:
– Download iOS 3.1.3 / 3.1.2 from Here.
– Download TinyUmbrella, latest version from Here.
– iTunes 9.2 for Mac and Windows from Here.

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Steps:
Step 1: Put your iPhone in DFU Mode, guide posted here.
Step 2: This Step for iPhone 3GS, iPod Touch 3G and iPod Touch 2G (MC), If you are on iPhone 3G or iPod Touch 2G then skip this Step.

  • Run TinyUmbrella (download above), and Hit Display SHSH (If you have already saved SHSH on your computer, then just drag and drop it in TinyUmbrella)
  • Now Hit on “Start TSS Server” button
  • Locate “C:WindowsSystem32driversetc” for Windows and “/etc/” directory for Mac, then locate “hosts” file andOpen it in Notepad (for Windows) or TextEdit (for Mac OS X) and add this at the bottom of the file.

74.208.105.171 gs.apple.com

Step 3: Now open iTunes 9.2 (download above) and do the following to Restore your iOS.

  • Hold down “Alt” button on Mac / “Shift” button on Windows and click on “Restore” then release the Alt / Shift button
  • Locate the Downloaded iOS FW from the Required above, and let iTunes Restore your Device.
  • After several process, iTunes will bring error 1015, 1013 or 101 message, just ignore it and Click ok

Step 4: You will find your Device in Recovery Mode, there’s two ways to exit Recovery Mode, may be with TinyUmbrella or RecBoot

  • To Exit Recovery Mode using TinyUmbrella (download above) just click on “Kick Device Out of Recovery” just below “Start TSS Server”
  • To Exit Recovery Mode using Recboot Just Download RecBoot (Windows / Mac) and Click on “Exit Recovery Mode” and your Device will restart automatically.

That’s it, Now you have Successfully Downgraded your Device to 3.1.3 or older!

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