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And what happens when old hardware is resold? How can anyone trust any future excorp hardware?

Well you don't. But corportations don't really care about that as much as they care about their data.

Admittedly it feels like AMD could have created something that allows the chip to be reset providing you have the original signing keys.

They should at least disclose to all prospective buyers that a current chip cannot be reset, and how to tell which firmware CA it's stuck on.