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windows 10 - BIOS settings have been changed to Legacy Support but PC still boots through UEFI mode - Super User
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How to enable Secure Boot on Think branded systems - ThinkPad, ThinkStation, ThinkCentre - Lenovo Support US
Lenovo ThinkStation P300 BIOS and Software - Lenovo ThinkStation P300 Workstation Review: Haswell plus Quadro
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