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Fortunately, I'm OK. The latest OS upgrade failed to install and bricked my computer so that no one could log in, let alone root. I was able to restore it using Time Machine but I don't think I'll go through that exercise again for a while yet.

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That probably takes some major doublethink: convincing yourself that a bricked machine is less broken than a vulnerable one.

you might be able to fix that. I had that too, had to manually update the preboot. Details are somewhere in here https://forums.developer.apple.com/thread/80174

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