com.apple.buildinfo.preflight.error 21 on macOS Monterey installation

For anyone out there trying to reinstall Monterey OS and getting this error, as I was, try first erasing the hard drive using the disk utility and then reinstalling the OS. That was the only way I could get past that error messsage.

Hope this helps someone, I spent over 2 hours researching this error before I discovered the solution.

[Re-Titled by Moderator]

Mac mini, macOS 12.7

Posted on Jan 2, 2025 10:55 AM

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com.apple.buildinfo.preflight.error 21 on macOS Monterey installation

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