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I have a system with an MBR install of Windows 10, which means that it's required to boot in Legacy/BIOS mode. However, no matter how much I look in ASUS Setup Utility I can't find an option to enable it.

I've learned that, for ASUS at least, this is called CSM and that others have their CSM option grayed out in the Boot section when they don't have an installed video card, so installing a video card (running integrated graphics at the moment) might sound like a good solution, but I don't see the option at all. Where is it?

One reddit user says:

This is a CPU/Chipset feature, you don't have CSM because your AMD CPU and the chipset on your motherboard don't support it.

...but I'm confident there should be an option since this system presumably booted at one point in time, with Windows installed on an MBR drive.

ASUS UEFI BIOS Utility

  • BIOS Version: 0805 x64
  • Build date: 09/21/2018
  • Bottom of screen: Version 2.20.1271

Board model: ASUS Prime z390m-plus

Andreas
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1 Answers1

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For all I know, this assertion:

Not an Asus thing. This is a CPU/Chipset feature, you don't have CSM because your AMD CPU and the chipset on your motherboard don't support it.

...might be true for the context in which it was made, but it is demonstrably not true as a general rule, as I've discovered. Here's how to enable CSM in this version of ASUS UEFI BIOS Utility even when it doesn't show up as an option under Boot:

  1. Activate [?]Search(F9) in the top right of the screen
  2. Type csm
  3. Press return
  4. The option appears and is not grayed out (even while using integrated graphics with no installed video card, in this case)

The sad part is that even after figuring this out I still can't answer where in the menu hierarchy you'd actually find this option outside of performing a search for it, so I have to conclude that it's missing entirely.

Andreas
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