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I am looking for a way to update my iPhone 3Gs to 4.0.1, and not to 4.1 so that I can jailbreak.

Can anyone help?

EDIT - I have now tried, and failed on two seperate machnines to restore from DFU mode to 4.0.1 The device is has 4 beta on it.

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2 Answers 2

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You can view information on jailbreaking iOS devices at Jailbreak Matrix and they include links to past firmware

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You can go to this website and download the correct firmware file to your computer. From there, plug your iPhone into your computer and shift-click (Windows) or option-click (Mac) the "Restore" button. From there, choose the firmware file your downloaded.

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Keep getting "the device isn't eligible for the requested build" –  Mild Fuzz Sep 28 '10 at 19:18
    
Hmm, perhaps this website doesn't have the correct firmware. Have you tried choosing "iPhone 4" under "Download iOS 4.0.1 via direct links here:"? If you have, have you tried the dropdown list? If you can somehow get the firmware elsewhere, the instructions will still apply. (Maybe try the link in Jon Erickson's answer?) –  Kevin Y Sep 29 '10 at 0:59

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