How to update the Machine Type and Model (MTM), System Serial Number (SN), or System Brand ID of system BIOS menu – ThinkCentre, ThinkStation - Lenovo Support GR
How to enter the BIOS on most Lenovo ThinkCentre desktops - The easy way! - YouTube
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How to enable Secure Boot on Think branded systems - ThinkPad, ThinkStation, ThinkCentre - Lenovo Support US
How to enable Secure Boot on Think branded systems - ThinkPad, ThinkStation, ThinkCentre - Lenovo Support US