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upradge froze, not won't boot up

I followed the command to upgrade the OS, but it froze half way, then shut down, now it won't boot up to get into the old OS

MacBook Air (2018 or later)

Posted on Jan 16, 2019 12:21 PM

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Question marked as Apple recommended


Boot into Recovery (Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD. If errors are found and repaired, run again until no errors reported.


Recovery http://support.apple.com/kb/HT4718




Posted on Jan 16, 2019 12:32 PM

1 reply

upradge froze, not won't boot up

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