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Here is the manual steps to downgrade iOS 4.0 to 3.1.3. Note before starting to downgrade iOS 4: you will need the ECID SHSH certificate for firmware 3.1.3.
Steps to Downgrade iOS 4.0 firmware to 3.1.3
1- Windows users: Navigate to c:\windows\system32\drivers\etc\ then double click on the “hosts” file and open in a notepad. Mac users: Navigate to the path “/etc/” and open the hosts file with TextEdit. (I’am in Windows and using NotePad2)
2- At the end of the “Hosts” file simply add the string “74.208.10.249 gs.apple.com”.
3- Then set up your device in recovery mode by simply turn off and unplug your device from your computer >> press and hold the Home button while reconnecting the USB cable to your iPhone >> after iPhone is connected it should power on the device >> continue holding the Home button, and you will see the iTunes logo appear and then finally a “Connect to iTunes” will be displayed >> release the Home button now.
4- Now open iTunes and do a normal reset by holding down the SHIFT key (Windows) or Alt key (Mac) and clicking restore in iTunes >> now select the original 3.1.3 firmware and wait for the completion
5- So now you’ve downgraded your iPhone / iPod Touch firmware back to 3.1.3
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Recent Tech News
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