H81M-C User's Manual
Page 64
...the various VGA, bootable devices and add-on devices for the F1 key to be displayed only if the third-party manufacturer had set Launch CSM to [Enabled]. Configuration options: [Legacy OPROM first] [UEFI driver first] [Ignore] 2-36 Chapter 2: Getting started Configuration options: [UEFI ... to select the type of network devices that you set the add-on devices or the Windows® UEFI mode. [Disabled] Disable the CSM to fully support the Windows® Security Update and Security Boot. Configuration options: [Disabled] [Enabled] 2.8.5 Option ROM Messages [Force BIOS] ...
...the various VGA, bootable devices and add-on devices for the F1 key to be displayed only if the third-party manufacturer had set Launch CSM to [Enabled]. Configuration options: [Legacy OPROM first] [UEFI driver first] [Ignore] 2-36 Chapter 2: Getting started Configuration options: [UEFI ... to select the type of network devices that you set the add-on devices or the Windows® UEFI mode. [Disabled] Disable the CSM to fully support the Windows® Security Update and Security Boot. Configuration options: [Disabled] [Enabled] 2.8.5 Option ROM Messages [Force BIOS] ...