NEC N8100-2773F Maintenance Manual page 36

Chapter 1 Maintenance
5. Troubleshooting
 Is secure boot enabled?

To make the option card recognizable as a bootable device when Secure Boot has been enabled, you
need to have an option card UEFI driver that has been signed with the Microsoft key. Set all option cards
to signed UEFI driver.
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Express5800/R120h-1M, R120h-2M (2nd-Gen) Maintenance Guide