How to Downgrade iOS 4 to 3.1.3

iOS 4.1 Beta was seeded to developers yesterday. Since the iOS 4.1 is currently only jailbreakable on iPhone 3G and iPod touch 2G (non-MC model), you may want to downgrade your other iOS based devices from iOS 4.1 so that you can jailbreak them on iOS 4, or iOS 3.1.3 / 3.1.2 (formerly iPhone 3.1.3 or 3.1.2).

The following step by step guide will help you rollback / downgrade to iOS 4, iPhone 3.1.3 and 3.1.2 from iOS 4.1 Beta as long as you have SHSH blobs saved for the respective firmwares for iPhone 4, iPhone 3GS, iPhone 3G and iPod touches.

Step 1

Go to C:/WINDOWS/system32/drivers/etc Open the Hosts file in notepad(Run As Admin)or it wont work.

At the end of the file paste this in:

74.208.10.249 gs.apple.com

Step 2

Press Shift +Restore MAC:Alt+restore then browse your IPSW file. And Just Restore

You may consult this blog entry for more information:
Downgrade iOS 4.1 iPhone 4, 3GS, 3G and iPod touch to iOS 4 / iPhone 3.1.3 / 3.1.2

Related articles

• PwnageTool Bundle for Jailbreaking iOS 4.3 Beta on iPhone 4 Released! (ithinkdiff.com)
• “Unofficial PwnageTool to Jailbreak Apple iOS 4.3 Beta 1 on iPhone 4″ and related posts (ziphone.org)
• Ultrasn0w Unlock Tool to be Available After iOS 4.2.5 or iOS 4.3 (geniusgeeks.com)
• PwnageTool Bundle for Jailbreaking iOS 4.3 (crenk.com)

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