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Thread: Downgrade 4.0.2 to 4.0.1

  1. #1
    Default Downgrade 4.0.2 to 4.0.1
    Hi everyone,

    I don't understand exactly how downgrade 4.0.2 to 4.0.1 . I heard that I need to pt it in DFU mode then shift + restore... But what do I do then?

    Thanks a lot guys
    Last edited by Olip123; 2010-08-19 at 06:17 AM.

  2. #2
    Retired Moderator iYeow's Avatar
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    You have to download the 4.0.1 ipsw from here :
    iClarified - iPhone - Where To Download iPhone Firmware Files From
    When you do the Shift + Restore , a box will pop up for you to browse to the 4.0.1 ipsw file and let it restore.
    Do it now, Apple is still signing 4.0.1.

    Make sure you have atleast Itunes 9.2
    DFU mode : Plug your iphone , hold both Power and Home button for 10 secs, then release the Power button while keep holding the Home button until you hear a sound on your computer. Once you hear the sound release the Home button, the Screen should be black. This is DFU mode.
    Last edited by iYeow; 2010-08-19 at 06:58 AM.

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