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Troubleshooting iMac (Retina5K, 27-inch, Late 2014) on macOS Big Sur 11.6: External USB Drive Boot Failure

This article provides solutions to help iMac (Retina5K, 27-inch, Late 2014) users running macOS Big Sur 11.6 who are experiencing issues with not being able to boot from an older macOS on an external USB drive.