![background image](http://html1.mh-extra.com/html/nec/express5800-r120h-2m/express5800-r120h-2m_maintenance-manual_4088202032.webp)
5. Troubleshooting
Express5800/R120h-1M, R120h-2M Maintenance Guide
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Chapter 1 Maintenance
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.