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 6502a

    Joined:
    Nov 10, 2011
    #1
    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

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #2
    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 6502a

    Joined:
    Nov 10, 2011
    #3
    Thank you. You're awesome.
     

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