Possible to downgrade FW on iPhone 4?

Discussion in 'Jailbreaks and iOS Hacks' started by lilrush, Jul 19, 2010.

  1. lilrush macrumors member

    Joined:
    Jan 1, 2008
    #1
    If you have SHSH backed up for 3.1.2, 3.1.3, and 4.0, can you downgrade an iphone 4 to 3.1.2? Just curious, and couldn't find this answer around so my guess is that you can't but it's worth asking.
     
  2. twoism macrumors member

    Joined:
    Apr 16, 2010
    #2
    Pretty sure you can't, since every SHSH is unique to the device, just like a serial number is. And since iPhone 4 has never been on 3.x.x then you can only downgrade from 4.0.1 to 4.0.
     
  3. mavis macrumors 68040

    mavis

    Joined:
    Jul 30, 2007
    Location:
    Tokyo, Japan
    #3
    The iPhone 4 was launched with iOS4. Earlier versions of iOS were never available for it.
     
  4. andybno1 macrumors 68040

    andybno1

    Joined:
    Nov 6, 2007
    Location:
    Liverpool, UK
    #4
    plus even if you could downgrade to 3.1 on iPhone you wouldn't be able to jailbreak as the jailbreak is hardware based and the iPhone 4 has new hardware
     
  5. dhlizard macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #5
    It's not possible to back up hashes for 3.x.x on an iPhone 4.
    Hashes from a 3GS won't work nor will hashes from a different iPhone 4
    An iPhone 4 certainly wouldn't run with 3.x.x firmware anyway.

    Fail.
     

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