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 US
Recommended way to enter BIOS - ideapad - Lenovo Support UY
How to Enter the BIOS on a Lenovo Laptop: 4 Easy Ways
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REQUEST] Unlock advanced menu on 2021 Lenovo Legion 5 PRO AMD - BIOS Modding Requests - Win-Raid Forum