Downgrade iMac from High Sierra to LionOS10.7 Possible?

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

  1. navigates macrumors 6502a

    Jul 13, 2008
    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


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

    Jul 13, 2008
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    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

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

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4 March 12, 2018