Symptoms

Affected Products: Dell Encryption Affected Platforms: Latitude 3150Latitude 3350Latitude 3450Latitude 3550Latitude 5330Latitude 5340Latitude 5350Latitude 5440Latitude 5450Latitude 5540Latitude 5550Latitude 7320Latitude 7330Latitude 7340Latitude 7350Latitude 7350 DetachableLatitude 7450Latitude 7640Latitude 7650Latitude 9430Latitude 9450 2-in-1Precision 3480Precision 3490Precision 3580Precision 3590Precision 5490Mobile Precision 3591Mobile Precision 5690 You may receive the following error during boot: Operating System Loader has no signature. Incompatible with Secure Boot. All bootable devices failed Secure Boot verification.

Cause

The issue is due to the Microsoft UEFI Certificate Authority (CA) disabled by default in the BIOS.

Resolution

To resolve, enable Microsoft UEFI CA in the BIOS. Boot into the BIOS for more information, reference the Dell Knowledge Base article How to Access UEFI (BIOS) System Setup from Microsoft Windows on your Dell Computer.Go to Boot Configuration Menu.Ensure that Enable Microsoft UEFI CA is On. Apply Changes and Exit to reboot. To contact support, reference Dell Data Security International Support Phone Numbers.Go to TechDirect to generate a technical support request online.For additional insights and resources, join the Dell Security Community Forum.

Support Cases