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KukitoSenpai Author

Level 1

5 points

MacBook Air 2015 downgrade

I have a friend’s MacBook that he wants me to downgrade it, how do I downgrade to macos Sierra or High Sierra?

MacBook Air

Posted on Jan 26, 2023 10:39 AM

Top-ranking reply

ku4hx

Level 7

23,586 points

Posted on Jan 28, 2023 11:44 AM

Create a bootable installer for macOS - Apple Support

What to do before you sell, give away, or trade in your Mac - Apple Support Point 8 is the relevant instruction for your specific task

Basically you create the Flash drive with the older OS, boot from it to install the OS then migrate data if you wish. Be sure you follow the steps precisely and have copious backups.

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MacBook Air 2015 downgrade

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