Downgrading iPhone 4 to older OS

Discussion in 'iPhone Tips, Help and Troubleshooting' started by Daddy Mac, Jul 14, 2010.

  1. Daddy Mac macrumors member

    Jun 9, 2010
    I dont know if this is possible but can you downgrade your iPhone 4 OS to an older one. This may help determine if the proximity sensor issue is hardware or software right? I dont know how all this works so be kind.
  2. rattleglans macrumors newbie

    Dec 14, 2009
    I'm mostly sure you can't
  3. hipvamore macrumors regular

    Jul 2, 2008
  4. draz macrumors 6502a

    Jun 20, 2010
    You can't because Apple releases specific firmware for each of their iPhones so there needs to be an iPhone 4 firmware for iOS 3.x.x which there is not.
  5. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    Like said above, not possible to downgrade it to anything but 4.0 cause thats the earliest firmware ever made for iphone 4's.
    3.0+ firmware were only made for 2G, 3G and 3GS models.

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