Downgrading Late 15 5k iMac to El cap

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

  1. apppen1 macrumors 6502a


    Oct 2, 2016
    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


    Oct 17, 2014
    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


    Feb 20, 2009
    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


    Oct 2, 2016
    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


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


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

    Jul 11, 2009
    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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