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by 999900000999 603 days ago
I can't find an official source, but from what I've heard the newer Macs need to boot from the internal SSD. https://www.reddit.com/r/mac/s/CZOHuFQcy4
1 comments
kersplody 603 days ago
Correct, the stage 2 bootloader and system firmware must be on the SSD. The OS can then boot from an external volume.

https://support.apple.com/guide/security/boot-process-secac7...

link