com.apple.buildinfo.preflight.error error 21 on iMac in Recovery Mode reinstalling Mac OS Monterey

I'm trying the reinstall Mac OS Monterey 12.6.7 through recovery. I get this error "com.apple.buildinfo.preflight.error error 21". Does this error have something to do with my wifi and firewall in my cable modem. I did check the drive with first aid, and everything is fine there. Just trying to reinstall the Mac OS through recovery mode. Any suggestions?

iMac 27″

Posted on Aug 11, 2023 09:09 PM

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Posted on Nov 9, 2023 03:10 PM

I was able to use "Command+T" on startup and connect the computer to another Mac. The hard drive showed up on the other computer where I was able to transfer all document & image files to an external hard drive. I did not lose anything. I like how Apple created the Operating System to keep the OS separately away the document+image+video files.

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Question marked as Top-ranking reply

Nov 9, 2023 03:10 PM in response to Ziteng_Han

I was able to use "Command+T" on startup and connect the computer to another Mac. The hard drive showed up on the other computer where I was able to transfer all document & image files to an external hard drive. I did not lose anything. I like how Apple created the Operating System to keep the OS separately away the document+image+video files.

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com.apple.buildinfo.preflight.error error 21 on iMac in Recovery Mode reinstalling Mac OS Monterey

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