2011 MacBook Air - Installed 10.8, Can't Go Back To 10.7

Discussion in 'MacBook Air' started by kolax, Dec 13, 2012.

  1. kolax macrumors G3

    Joined:
    Mar 20, 2007
    #1
    I upgraded a 2011 MacBook Air to Mountain Lion, however, it isn't playing nice with some enterprise things, so I want to put Lion back on it again.

    Booting the Air with a USB stick containing the Lion installer doesn't work (see photo below). I booted it off a USB stick containing the Mountain Lion installer instead, and loaded Disk Utility to wipe the hard drive, because I thought it would refuse to boot the USB stick containing 10.7 if it saw 10.8 was installed.

    Anyway, that didn't help, because I still can't it to boot from my Lion USB installer.

    When I hold alt and select the Lion installer, I get this screen for about 10 secs before the machine shuts down. I've re-made the Lion USB stick, and I'm using the same USB stick that I used to make the Mountain Lion installer.

    Any ideas?
     

    Attached Files:

  2. justperry macrumors 604

    justperry

    Joined:
    Aug 10, 2007
    Location:
    In the core of a black hole.
    #2
    Might be a permissions problem, or the OS is not blessed.

    Can't you do an internet recovery, don't know if you can choose 10.7 though.
     
  3. kolax thread starter macrumors G3

    Joined:
    Mar 20, 2007
    #3
    Found out it is because the Lion image I have is older than the MacBook Air, so doesn't have the boot drivers needed.

    I'm re-downloading Lion from the App Store.
     

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