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Discuss iPhone 3G, 5.15.04, iOS 4.1 at the iPhone 3G - Hackint0sh.org; I was handed a fully upgraded 3G to 4.2.1/05.15.04 today. I was able to downgrade ...
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    Senior Professional Array bimmerme's Avatar

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    Default iPhone 3G, 5.15.04, iOS 4.1

    I was handed a fully upgraded 3G to 4.2.1/05.15.04 today. I was able to downgrade it to 4.1 and then to 3.1.2 and found out it has saved SHSH blobs for 4.0 and 4.1.
    I need to somehow downgrade the baseband to unlockable version.
    Is there any way to "upgrade" to 4.0 in a way that it will reflash the baseband too?
    In other words, I want to force iTunes to reflash the baseband.
    Last edited by bimmerme; 01-13-2011 at 08:00 AM.



  2. #2
    Super Moderator Array Olethros's Avatar

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    Quote Originally Posted by bimmerme View Post
    I was handed a fully upgraded 3G to 4.2.1/05.15.04 today. I was able to downgrade it to 4.1 and then to 3.1.2 and found out it has saved SHSH blobs for 4.0 and 4.1.
    I need to somehow downgrade the baseband to unlockable version.
    Is there any way to "upgrade" to 4.0 in a way that it will reflash the baseband too?
    In other words, I want to force iTunes to reflash the baseband.
    Unless the iPhone has baseband bootloader 5.8 - you cannot force a downgrade of baseband.

    TinyUmbrella can check your baseband bootloader version. Only a fraction of a percent of the iPhone 3G that were manufactured have 5.8 baseband bootloader.


    iTunes has *NOTHING* to do with this, the security model is built into the phone and enforced by the baseband bootloader and bootrom.
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
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