Select UEFI Boot Mode or Legacy BIOS Boot Mode (BIOS)
Your system supports both UEFI Boot Mode and Legacy BIOS Boot Mode.
The operating system can only boot with the boot mode property value that
was initially set at installation. If you change the boot mode property
value after installing the operating system, the operating system will
become inoperable (will not boot). To resolve this issue, you must change
the boot mode property value back to its initial setting.
To view or set the target boot mode on your server using the BIOS Setup
Utility, follow these steps:
Access the BIOS Setup Utility.
Boot the system.
Boot messages scroll across the console screen.
Press the F2 key (or Ctrl +E from a serial terminal) continuously.
The BIOS Setup Utility main screen appears.
From the BIOS Main menu screen, select Boot.
From the Boot screen, select UEFI/BIOS Boot Mode, and press Enter.
The UEFI/BIOS Boot Mode dialog box appears.
You cannot configure the boot order list after switching the boot
mode. A system reboot is required to properly populate the boot order
list with devices that support the chosen boot mode.
Use the up and down arrows to select Legacy BIOS Boot Mode or UEFI Boot
Mode, and then press Enter.
To save the changes and exit the screen, press F10.