Downgrade iMac from High Sierra to LionOS10.7 Possible?

Discussion in 'macOS' started by navigates, Mar 12, 2018.

  1. navigates macrumors 6502a

    Joined:
    Jul 13, 2008
    #1
    Hi All,

    I need to downgrade to LionOS because the developer needs to fix the iOS App which is in the old architecture. Is it possible to do this? the developer is asking for an external hard drive.

    Since I'm not good with Macs I believe he is taking me for a ride :)

    Much Appreciate.
     
  2. Novecento macrumors member

    Novecento

    Joined:
    Jul 6, 2011
    #2
    Depends on the iMac model. Did your iMac exist when Lion was released?
     
  3. navigates thread starter macrumors 6502a

    Joined:
    Jul 13, 2008
  4. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #4
    No, the oldest version of macOS you can downgrade too is the version that was preinstalled when you bought the iMac. I could be wrong, but the 21.5" iMac you have listed haa Sierra installed, there's no way to install such a legacy OS on your iMAc. It simply lacks the device drivers to run the iMac.


    You can try running Lion in a VM, i.e., Vmware Fusion
     
  5. navigates thread starter macrumors 6502a

    Joined:
    Jul 13, 2008
    #5
    Thanks for the tip. I will also try Parallels. This is clear.
     

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4 March 12, 2018