Help! I tried to go back to Sierra and I get an error

Discussion in 'macOS High Sierra (10.13)' started by Jacoblee23, Aug 10, 2017.

  1. Jacoblee23 macrumors 65816

    Nov 10, 2011
    I was on High Sierra beta and decided to sell my 2015 MacBook Pro since I upgraded to the 2017 touchbar one. I created a bootable
    Installer of Sierra on my flash drive and tried to install Sierra on the 2015 Pro to sell and I got the error while preparing installation in the final three seconds of the installation. I read online sometimes it’s an issue with the computers time so I changed it to my time in the terminal. Second time around same error. Now my MacBook is bricked. Can’t sell it now or use it. What do I do?
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Use Internet recovery. Hold command-option-r at start and select your wifi. You will see a spinning globe while the recovery utility downloads. Once it does, use Disk Utility to erase the entire disk then reinstall the OS.
  3. Jacoblee23 thread starter macrumors 65816

    Nov 10, 2011
    Thank you. You're awesome.

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