OS high sierra upgrade causing black screen.

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mamoisan Author

Level 1

8 points

OS high sierra upgrade causing black screen.

How do I UNDO the upgrade?

MacBook Pro

Posted on Aug 13, 2018 6:37 AM

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Answer 1

Best reply

CarlAVII

Community Specialist

Aug 14, 2018 5:45 AM in response to mamoisan

Hello mamoisan,

Thanks for asking the Apple Support Communities for help reverting back to a previous macOS. This help article will provide the information you seek.

macOS Sierra: Revert to a previous macOS version

The steps are the same for macOS Sierra and macOS High Sierra. Thanks and have a wonderful day.

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Answer 2

mamoisan Author

Level 1

8 points

Aug 14, 2018 6:06 AM in response to CarlAVII

Thank You, Allen, for getting back to me. I did use Time machine to return my drive to Sierra. I lost about 6 months of information but I'm up & running. Now I'm getting High Sierra update messages again, also how will I know which security updates I can do?

Thank You for your help

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Answer 3

Eric Root

Level 10

684,063 points

Aug 15, 2018 10:23 AM in response to mamoisan

The security updates are based on your current OS. If they show in the App Store Updates tab, you can install them.

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OS high sierra upgrade causing black screen.

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