iPhone Where to find iOS 1?

Discussion in 'Jailbreaks and iOS Hacks' started by Ryan Burgess, Dec 25, 2013.

  1. Ryan Burgess macrumors 6502

    Jan 26, 2013
    Hi, all. I have an iPhone 2g the first model and I want to downgrade it back to it's original firmware that it shipped with. I'm assuming it's iOS 1 or something, does anyone know where I can find the IPSW for this?

  2. Ryan Burgess thread starter macrumors 6502

    Jan 26, 2013
  3. braddick macrumors 68040


    Jun 28, 2009
    Encinitas, CA
    Please elaborate.
    I too would like to downgrade my iPhone 2G back to 1.X

    What was the procedure you used to do so?
  4. darricksailo macrumors 601


    Dec 18, 2012
    you should be able to restore to 1.x as long as you have the ipsw as there was no such security checks back then
  5. AppleDApp macrumors 68020


    Jun 21, 2011
    When did security checks kick in? I wouldn't mind going back to iOS 5.
  6. jav6454 macrumors P6


    Nov 14, 2007
    1 Geostationary Tower Plaza
    Wrong. There are security checks. It is called the Baseband mismatch error (150x range errors)

    This error happened because the higher version of the baseband did not match the lower version of the software it was supposed to go with. In other words prevents downgrading.

    You could have higher version software and lower version baseband, but not the other way around.

    So, if you have anything other than the original 1.0.0 software, your iPhone will throw an error.

    However, there is a way. But I don't think it will work. It's worth a shot.

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