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Can't install windows 10 with UEFI support

Anonymous
2023-02-27T12:09:39+00:00

Hi,

I created USB installation media and performed a custom install of Windows 10 pro on a brand new NVMe disk and it got formatted as MBR instead of GPT. Windows got installed in legacy mode. I tried following this article: https://answers.microsoft.com/en-us/windows/forum/all/convert-an-existing-windows-10-installation-from/aa8c2de3-460b-4a8c-b30b-641405f800d7 . I can successfully reformat the disk to GPT but can't find the settings from step 4 in my BIOS. (I reformated to GPT, reinstalled windows and my disk is still somehow MBR and windows is still legacy). I also don't have "UEFI Firmware Settings" in my advanced settings at all.

I have AMI UEFI BIOS with SM BIOS ver. 3.0 also I upgraded my BIOS to the latest version available for my model of motherboard. According to a google search, it should have UEFI support.

Windows 10 Pro 64-bit

BIOS Version/Date:F6, 10/04/2018

SM BIOS 3.0

BIOS MODE: Legacy

Motherboard: GA-270-D3H

Processor: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz, 4201 Mhz, 4 Core(s), 8 Logical Processor(s)

RAM: Corsair Vengeance LPX 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory

Storage: Kingston KC3000 1.024 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive

Graphics Card: Asus DUAL GeForce GTX 1060 6GB 6 GB Video Card

Does my hardware not support UEFI? This is my first time installing Windows by myself, English is not my first language and I don't have any computer knowledge whatsoever, so I am worried that I am doing something wrong and potentially damaging my PC. The PC was first built July 2018, I changed RAM and Storage this week.

Best regards,

T

Windows for home | Windows 10 | Install and upgrade

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  1. DaveM121 871.3K Reputation points Independent Advisor
    2023-02-27T12:42:54+00:00

    Hi Tjašš,

    I am Dave, I will help you with this.

    1

    Are you using a newly created bootable USB created with the media Creation Tool?

    2

    Did you use Command Prompt - Diskpart to convert the partition style on your drive to GPT?

    3

    Before you started the installation, did you set your BIOS to UEFI, disable CSM permanently and temporarily disable Secure Boot during the installation?

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  2. DaveM121 871.3K Reputation points Independent Advisor
    2023-02-27T17:18:58+00:00

    Hi Tjašš,

    1

    Please provide a photo of all the tabs available in your BIOS, so I can see all settings you have access to.

    2

    If you have now used those steps to convert the drive to GPT, what happens if you try to start the Windows installation on the blank disk?

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  3. Anonymous
    2023-02-27T17:13:16+00:00

    "Then close Command Prompt

    Then you need to go into BIOS (usually by pressing the F2 key when your start your PC and change BIOS to UEFI and disable CSM permanently and temporarily disable Secure Boot during the installation."

    Hi,

    I did everything up to this part. I restarted to get into BIOS. When I go to my bios there is no option to change BIOS to UEFI ...no text about CSM either. So I am stuck at this now.

    This is how my screen looks:

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  4. DaveM121 871.3K Reputation points Independent Advisor
    2023-02-27T13:40:08+00:00

    Hi Tjašš,

    It sounds like you did not convert your drive to GPT, to convert the drive to GPT, you need to use these steps:

    At the very start of the Installation Process, press Shift + F10, or Shift + Fn + F10 to open Command Prompt

    Run this command and hit Enter:

    diskpart

    Run this command and hit Enter:

    list disk

    (Make note of the disk number you want to convert and enter it into the next command - replace X)

    Run this command and hit Enter:

    select disk X

    Run this command and hit Enter:

    clean

    Run this command and hit Enter:

    convert gpt

    Then close Command Prompt

    Then you need to go into BIOS (usually by pressing the F2 key when your start your PC and change BIOS to UEFI and disable CSM permanently and temporarily disable Secure Boot during the installation.

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  5. Anonymous
    2023-02-27T13:31:34+00:00

    Hi Dave, thank you for your answer!

    1. Yes
    2. No I just selected my drive which had just all unallocated space. https://answers.microsoft.com/en-us/windows/forum/all/how-to-perform-a-custom-installation-of-windows-11/38adfa8c-32f8-4354-8c53-13b5f2cf7e44 I looked here in the part where it says "Select the Primary Partition then click Next" there was only one drive with no partitions. Was I supposed to create partitions here? In tutorials online it says to leave the drive empty.
    3. I wasn't shown the screen that would allow me to boot in to BIOS, just a black screen and the windows installation media after. When I access BIOS now I can't see any secure boot options, CSM or ways to change BIOS to UEFI, so I don't really understand this part.
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