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Thread: 3gs 3.1.2 upgrade to 4.0

  1. #1
    Default 3gs 3.1.2 upgrade to 4.0
    Hey guys,

    I need a little help. I am using a 3gs 3.1.2 with a spirit hack. I would like to upgrade to 4.0.

    What can I do? I have looked around, but I can find anything about upgrading the firmware unless I am using itunes to upgrade to 4.1.

    I have an SHSH with Cydia, and I tried to downgrade to the original 3.1.2. I got error 3149.

    I am running Win 7 and the lastest version of itunes (

    Any suggestions? I feel like I am missing something really easy.

  2. #2
    Retired Moderator iYeow's Avatar
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    Do you have the new or old bootrom

  3. #3

    Thanks for the quick reply. I have the new bootrom... which is bad, but how bad?

  4. #4
    If you have SSH run tinyumbrella start TSS server and downdrade. When you downgrade you may need to kick device out of recovery.

    You won't be able to upgrade to iOS 4.0/4.0.1 without SHSH files

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