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The BIOS firmware supports both legacy BIOS and Unified Extensible Firmware Interface (UEFI); the default setting is Legacy. Some operating systems support both legacy BIOS and UEFI BIOS and some support legacy BIOS only. These are the options for setting the BIOS mode before installing the OS:
If the OS supports legacy BIOS only, you must make sure that BIOS is set to legacy mode before you do the OS installation.
If the OS supports both legacy BIOS and UEFI BIOS, you have the option of setting BIOS to either legacy mode or UEFI mode before you perform the OS installation.
POST messages appear on the console.
The BIOS Setup Utility main screen is displayed.
The Boot Menu screen is displayed.