Intel x540 Network Adapter does not support booting PXE with UEFI - ThinkStation - Lenovo Support AT
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How to configure your BIOS to allow for PXE network or USB booting (Lenovo Thinkpad P50) - Tutorial Geek
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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
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