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Thread: How do I downgrade iphone 3g IOS

  1. #1
    Default How do I downgrade iphone 3g IOS
    I have a iphone 3g running on IOS 4.0.2 and want to downgrade to IOS 3.1.3, I have downloaded the 3.1.3 file from this site onto my comp and am now just totally stuck! Can anyone explain how to do this in simple terms?

  2. #2
    Super Moderator iYeow's Avatar
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    Yes, I can guide you. Put your iphone into DFU mode
    DFU mode : Have you iphone plug into the pc, while you iphone is still powered on, hold down both the Power + Home button for 10 secs and then release the Power button but keep holding the Home button until you hear the first sound " ta da " something like that, your iphone is Black, immediately let go. You are now in DFU mode.
    Do the shift + Restore to 3.1.3 ipsw which you have already downloaded.
    It will restore and you will end up in recoery mode, error 1015.
    You must also download Tiny Umbrella, use the function kick out of recovery.
    Your Iphone will be booted up to Emergency Screen , activate with a sim card and do the jailbreakme.com.
    If you don't have the official sim, then use Redsn0w 0.9.4 to hactivate , jailbreak for you from Emergency sceen, but you have to download 3.1.2 ipsw when running Redsn0w.
    Finally, unlock with Ultrsn0w again.
    That's it.

    I hope all these are clear to you and is presented in the simplest term...
    Last edited by iYeow; 09-15-2010 at 01:44 PM.

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