when trying to do an upgrade from ios 4.1 to 5.01 it says an unknown error has occure

Discussion in 'Jailbreaks and iOS Hacks' started by pectin232, Dec 25, 2011.

  1. pectin232 macrumors 6502

    Joined:
    Jul 22, 2008
    #1
    when trying to do an upgrade from ios 4.1 to 5.01 it says an unknown error has occured. It cannot upgrade the iPhone 4. I currently have 4.1 of the IOS Jailbroken. It did not freeze or anything but somehow I cannot upgrade. I am using iTune 10.5.2.11
     
  2. SplicedBanjo macrumors regular

    Joined:
    Dec 13, 2011
    #2
    If you jailbroke your iPhone, you might have to Restore it back to factory settings to be able to upgrade.
     
  3. Arelunde macrumors 6502a

    Arelunde

    Joined:
    Jul 6, 2011
    Location:
    CA Central Coast
    #3
    Also, if after a restore, you still get the error message when trying to upgrade, you might try to download the update to a different computer (not the primary iTunes one), install the upgrade from there but don't sync to that computer when it asks.

    Unplug your device and then sync with the main iTunes computer after the upgrade.

    I've had to do this every time using my laptop, which is not my primary iTunes sync computer. It works just fine.
     
  4. TriJetHero macrumors 601

    TriJetHero

    Joined:
    Oct 13, 2010
    Location:
    World
    #4
    Try putting it in DFU mode and then click restore through itunes.

    Use Redsn0w to get you device in DFU
     
  5. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit

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