OptiPlex, Precision, Wyse, and XPS. Go to General > Boot Sequence > Boot List Option - Change to UEFI. Click Apply > click Exit - Save the Changes. Enabling Secure Boot. Secure Boot is controlled by the computer firmware (BIOS) and can be enabled with a few simple steps: Boot your computer. Tap the F2 key when the Dell logo appears to enter the ... More @Wikipedia
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