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Thread: iTunes error 1604

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i downloaded a custom 4.0 JB firmware for my 3GS and everytime i try to restore to the custom.ipsw i get an error 1604 after about 5 minutes. any ideas
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  1. #1
    iPhone? More like MyPhone MikeT674's Avatar
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    Default iTunes error 1604
    i downloaded a custom 4.0 JB firmware for my 3GS and everytime i try to restore to the custom.ipsw i get an error 1604 after about 5 minutes. any ideas or thoughts? Thanks Guys.

  2. #2
    Livin the iPhone Life
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    What firmware version are you on and which did you use to jailbreak?
    We're all just toymakers in the game of life.

  3. #3
    iPhone? More like MyPhone MikeT674's Avatar
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    im on 4.0. i was on 3.1.3 jb with spirit. and i updated to 4.0 last week.

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    You can't use a custom firwmare once you're on 4.0, you'll need to downgrade to 3.1.3 (or lower) first and then shift-restore to a custom 4.0 firmware from there.

    To downgrade, you'll need to have your 3.1.3 (or lower) SHSH files stored. You have them stored on Saurik's/Cydia's server if you've ever clicked the 'Make my life easier' button in Cydia. You can read about the downgrade process here: Caching Apple's Signature Server - Jay Freeman (saurik)

    Just to add, all this requires that your phone has the old bootrom.
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