You have the
Platform Mode set to "
Setup Mode", which means
Reset to Setup Mode has been chosen at some point, which essentially erases the default Secure Boot Database, and thus prevents Secure Boot from enabling.
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Further down on the BIOS >> Security page is the option to
Restore Factory Keys and if you select that and press
Enter, it will restore the Secure Boot Database to its default, put the
Platform Mode back to "
User Mode" and allow you to re-enable Secure boot
(You may have to Restore Factory Keys, and then Save/Exit before you can go back into the BIOS to enable Secure Boot, but I cannot remember).
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