User Manual

PRIME/Pro/ProArt/TUF GAMING B550 / A520 Series BIOS Manual

Boot up NumLock State

This item allows you to enable or disable power-on state of the NumLock.

Conguration options: [On] [Off]

Wait For ‘F1’ If Error

This item allows your system to wait for the <F1> key to be pressed when error occurs.

Conguration options: [Disabled] [Enabled]

Option ROM Messages

[Force BIOS] The third-party ROM messages will be forced to display during the boot

sequence.

[Keep Current] The third-party ROM messages will be displayed only if the third-party

manufacturer had set the add-on device to do so.

Interrupt 19 Capture

[Enabled] Execute the trap right away.

[Disabled] Execute the trap during legacy boot.

AMI Native NVMe Driver Support

This item allows you to enable or disable all NVMe device native OpROM.

Conguration options: [On] [Off]

Setup Mode

[Advanced Mode] This item allows you to go to Advanced Mode of the BIOS after POST.

[EZ Mode] This item allows you to go to EZ Mode of the BIOS after POST.

CSM (Compatibility Support Module)

This item allows you to congure the CSM (Compatibility Support Module) items to fully

support the various VGA, bootable devices and add-on devices for better compatibility.

Launch CSM

[Enabled] For better compatibility, enable the CSM to fully support the non-UEFI

driver add-on devices or the Windows

UEFI mode.

[Disabled] Disable the CSM to fully support the non-UEFI driver add-on devices

or the Windows

UEFI mode.

The following items appear only when you set the Launch CSM to [Enabled].

Boot Device Control

This item allows you to select the type of devices that you want to boot.

Conguration options: [UEFI and Legacy OPROM] [Legacy OPROM only]

[UEFI only]

Boot from Network Devices

This item allows you to select the type of network devices that you want to

launch. Conguration options: [Ignore] [Legacy only] [UEFI only]