Lenovo ThinkSystem NE2572 Quick Start Manual page 16

6. During the boot procedure, press either the Delete or the Esc key to enter the Basic
7. After entering the BIOS menu, navigate to the "Security" tab.
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Lenovo ONIE Quick Start Guide for NE2572
Input/Output System (BIOS) menu.
INIT: reboot: Restarting system
...
Press <DEL> (Terminal Not applicable) or <ESC> to enter setup...
The BIOS menu appears on screen.