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Thread: 3gs 5.1.1 downgraded to 5.13.04 no ATT signal

  1. #1
    Default 3gs 5.1.1 downgraded to 5.13.04 no ATT signal
    The tedious history of JB, unlock, flash to ipad base band, etc. is here.

    Basically, I have a SIM from an old ATT cell phone that I put into a 2g iphone, and it works just fine as a phone (no data plan). I want to do the same thing with this 3gs. Since JB and unlocking is not working, I suspect there's something else going on since I get a "SIM not allowed" message in settings/general/about/network, but the phone otherwise knows it has a SIM in it, and knows that the carrier is ATT.

    Is this something that ATT will solve for me?

    Thanks for the help!

  2. #2
    Idk which SIM you have but i suspect it is lock sim.

  3. #3
    Retired Moderator
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    What do you mean jailbreaking and unlocking the phone isn't working? Could you describe what you tried using and how it isn't working? The phone may be blacklisted, that's why I ask. I could be wrong though.

  4. #4
    your downgrade failed to apply correctly redo it

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