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Downgrading macOS on iMac

Trying to downgrade OS on iMac from Monteray to Sierra. Error message when installing "Error occured during installation. Try again." Tried 3 times. What's going on and soluition?

iMac 27″, macOS 12.6

Posted on Jan 14, 2023 12:22 PM

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Question marked as Top-ranking reply

Posted on Jan 15, 2023 4:48 PM

Does this help?


Erase and reformat a storage device in Disk Utility on Mac - Apple Support

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Downgrading macOS on iMac

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