iPhone Help with "USB Communicatin Problem" after IOS Downgrade

Discussion in 'Jailbreaks and iOS Hacks' started by iFoneBricker, Jan 3, 2013.

  1. iFoneBricker macrumors newbie

    Jan 3, 2013
    I am trying to unlock a friend's iPhone 3g.

    She previously installed iOS 4.2.1. I downgraded her iOS to 3.1.3 after downloading the ipsw using iTunes. When it gave me the expected 1015 error, I used TinyUmbrella to exit recovery mode.

    The Baseband is set to 05.15.04, so I am planning on setting it to the iPad baseband (06.15.00) using RedSn0w. When I put the iPhone into DFU mode, RedSn0w returns "USB Communication Problem". I tried RedSn0w before performing the iOS downgrade and it communicated with the iPhone just fine. I have done it many times. At this point, I have tried restarting my computer and the devices. Nothing seems to work.

    Advice Please!

    iTunes 11.0
    TinyUmbrella v5.10.15
  2. dhlizard macrumors G4


    Mar 16, 2009
    The Jailbreak Community
    Installing the iPad baseband (other than to facilitate a downgrade of the baseband to 5.13.xx) is a bad idea.
    It creates more problems than it solves.
    Read this http://blog.iphone-dev.org/post/26534086824/baseband-freedom
    Tutorial on iClarified.com

    Try a different USB cable, or USB port
    Clean out the dock connector
    Or try a different computer
  3. iFoneBricker, Jan 3, 2013
    Last edited: Jan 3, 2013

    iFoneBricker thread starter macrumors newbie

    Jan 3, 2013
    Thanks dhlizard.

    In fact, if possible, I am hoping to downgrade to 5.13.xx. At the moment though, I am stuck because I am unable to get RedSn0w to communicate with my devise. Any insights there would be excellent, then I'll try to tackle the downgrade issue :)

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