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Thread: Downgrade 3g 4.1 to version 4.0

  1. #1
    What's Jailbreak?
    Join Date
    Sep 2010
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    Default Downgrade 3g 4.1 to version 4.0

    What is the process to downgrade iphone 3g from 4.1 to 4.0?

  2. The Following 2 Users Say Thank You to goblues For This Useful Post:

    Erik234 (2010-09-19), Frederick72 (2010-09-19)

  3. #2
    Retired Moderator iYeow's Avatar
    Join Date
    Feb 2008
    Vancouver, Canada
    Thanked 2,764 Times in 2,652 Posts

    You need shsh blogs stored in Cydia or stored locally.
    Assuming you have 4.0 shsh blogs with Cydia.
    PC : Vista/win7 : Run Notepad as Admin and open up your hosts file and add this line save it and reboot
    Put your iphone into DFU mode
    Do the Shift + Restore to 4.0
    Error 1015 pops up, Use Tiny Umbrella to kick it out
    Now at Emergency Screen.
    Run Redsn0w 0.9.5b5-5 and point to 4.0 ipsw
    You are set on jailbreaking but not unlock.

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