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Windows 10 CMS UEFI and Legacy

Anonymous
2021-10-30T20:54:54+00:00

I enter my BIOS and go to CSM, change to UEFI, and restart always comes back to BIOS.

If I change CSM to UEFI and Legacy, Windows 10 will boot up, but the Health Check says I need to change the CSM in order to upgrade to Windows 11.

How to solve this?

Windows for home | Windows 10 | Install and upgrade

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  1. Anonymous
    2021-10-30T21:14:35+00:00

    CSM is the Compatibility Support Module and provides backward combability for components that are not compatible with UEFI while still enabling UEFI. If you disable this feature then some components may stop working; if it defaults back to that feature then something isn't compatible. It could be worse: my computer wouldn't boot because the GPU was not UEFI compatible. I had to clear the BIOS settings by shorting the reset pin on the board and then troubleshoot and update the GPU firmware (not the drivers, the firmware on the card).

    Make sure you do these things in this order:

    1. Convert your boot drive to a GUID Partition Table (GUID) if it is not already
    2. Update your motherboard BIOS from the manufactures website
    3. Ensure your graphics card is UEFI compatible, if not, then validate the firmware is updated (Nvidia has a tool to update theirs), but use the correct update tool per the hardware manufacturer
    4. Ensure other components are UEFI-compatible and update them if they are not
    5. Disable CSM and enable UEFI

    That did it for me.

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