Downgrading Late 15 5k iMac to El cap

Discussion in 'iMac' started by apppen1, Mar 10, 2017.

  1. apppen1 macrumors 6502a

    apppen1

    Joined:
    Oct 2, 2016
    #1
    I was wondering if someone already tried to downgrad their iMacs that came pre-installed with Sierra to El Capitan? I am about to do it but I'm not sure if there will be issues although there shouldn't be because the late 2015 iMacs came with El capitan and are using the same hardware right?
     
  2. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #2
    You should be able to downgrade a late 2015 iMac to an El Capitan clean install without any problems, though I fail to see a reason to do so.
     
  3. Fishrrman macrumors G5

    Fishrrman

    Joined:
    Feb 20, 2009
    #3
    Do you have the computer in front of you yet?
    If so, which version of the OS is on it?

    I bought a -new- (not refurbished) MacBook Pro in December that came with El Capitan installed.

    If the iMac has Sierra, you'll probably want something like a bootable USB flash drive with the installer on it to do the job.
     
  4. apppen1 thread starter macrumors 6502a

    apppen1

    Joined:
    Oct 2, 2016
    #4
    I just did the downgrade using a USB stick and it is working flawlessly so if someone is looking to do the same on their iMac the answer is: Yes it works.
     
  5. nambuccaheadsau macrumors 65816

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
  6. apppen1 thread starter macrumors 6502a

    apppen1

    Joined:
    Oct 2, 2016
    #6
    Because I needed to use a Logic Pro X plugin that wasn't updated for Sierra.
     
  7. chrfr macrumors 603

    Joined:
    Jul 11, 2009
    #7
    It works because the 2015 iMac first was sold with El Capitan. Once a new model iMac is released, this will no longer work.
     

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