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  1. After an hour on with level 1 and then level 2 support, and hours on my own to do a simple task of erasing and restoring the osx sierra, I caved and went to the Apple Genius Bar.
    They took care of it, but no hints about what they could do that phone support couldn’t do.
    The computer worked perfectly before I tried to repurpose it. Every test offered passed ok.
    Best that they didn’t charge for their services.
    When there are 700 people with the same error, don’t work too hard when there is free support from Apple.

  2. Hi Thanks so much! Option 4 with Option Command R works for my MacBook 2017 in 2023. So far you are the only page to clarify the difference of Command R, Option Command R and Shift Option Command R.

  3. BRO! I’ve spent the past 2 days trying to figure this out and in 5 minutes I was successful in download MOS on my 2010 MB Pro! Was getting the error nonstop til I read this! THANK YOU! Downloading MOS as I type this!

  4. Many thanks Kurt. I have spent hours trying to upgrade a MacBook Pro early 2011 from Sierra to High Sierra with no success until I found your article.
    Step 4 and selecting ‘Option-Cmd-R’ for latest compatible macOS version did the trick.
    The whole process did take a couple of hours though.

    1. hey john! when i tried this method, i was stuck at a screen with just the apple logo, without a loading bar or anything else. how long did it take you before something happened?

  5. My mac has that folder with a question mark, so when I try to reinstall the OS with command and R, it’ll take me through to the 1 second left and I’ll get that “error occurred while preparing the installation. Try running the application again.”. I cannot do anything else but try and try again and it never reinstalls the OS (High Sierra). I did check the date/time and it was fine. I can’t get it started in safe mode, cause I have the folder with the question mark, etc.

    1. Did you happen to fix that problem if you did could you please show me how I can’t seem to fix mine I have the same problem

      1. Hello

        I was experiencing the same problem as you, Vai, Pritt, Jeff and Tom.

        I solved it by using

        “Method 4
        Turn off your Mac.
        Turn on your Mac and immediately press one of the keyboard combinations:
        – Option-⌘-R: This will update your Mac to the latest compatible macOS version.”

        It didn’t work the first time. The second time it worked.

        1. Howdy! I pushed those buttons and it sent me directly to a globe icon and then asked me for my wifi password. Did this happen to you? And if so what were your next steps?

  6. Option 4 got my Early 2011 vintage MacBook Pro to upgrade from Sierra to High Sierra. That made it compatible with software required for my college math class. Thank you so much.

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