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Failing to install Windows 10 in UEFI boot mode

Hi

I’ve been reading articles in this community and others the last couple of days and I’m getting more and more confused.

I have made my first build with the following equipment:

Asus Prime Z370-P (Bios version 1002x64, firmware 11.8.50.3470)
Intel Core i5 8400 2,8GHz
Samsung 860 EVO Series MZ-76E250B 250GB
and other..

I purchased a Windows 10 Home Eng Retail licence on USB directly from Microsoft.

When installing Win 10 it always ends up being installed in Legacy BIOS mode.

First time, I only followed the instructions on screed and had a successful installation, but in Legacy Bios mode.

The second time I made the following change the UEFI:
Boot\Secure boot\OS type = Windows UEFI mode

Installation was still being made in Legacy Bios mode.

Third time
Boot\Secure boot\OS type = Windows UEFI mode
When Win 10 installation started I entered the cmd prompt and made the following commands in order to change to gpt
Diskpart
List disk
Select disk 0
convert gpt
Exit

I then continued with Windows installation which still ended up in Legacy Bios mode.

I’m getting crazy and I don’t know what I’m going to do : (

What do I need to change in the UEFI?
What do I need to do to prepare the disk for UEFI mode?
Is my purchased Windows 10 USB key prepared for UEFI mode?
Can someone describe, step by step what I need to do?

Answer
Answer

I finally made it!

The failure was caused by two mistakes resulting in the USB stick not being recognised by UEFI when booting.

Mistake 1.

The Win 10 USB stick I received from Microsoft didn’t work. Despite their assurance in their help desk that the key is prepared for UEFI.

I downloaded a new ISO-image using the media creation tool from Microsoft. https://www.microsoft.com/en-gb/software-download/windows10

I exited the tool when the image was downloaded and then used Rufus (https://rufus.akeo.ie) to create a UEFI bootable USB stick

Mistake 2.

I put the USB stick in one of the ports in the front of my computer chassi. That didn’t work. I then put the USB stick in the back of the computer in one of the ports that is built in the motherboard. The newly made USB stick was then recognised but not the one I got from Microsoft.

Those were the two main mistakes.

Continue

When I continued I made sure to disable the Launch CSM in UEFI bios setup.

Microsoft then has a very good step by step installation manual here:

https://www.tenforums.com/tutorials/1950-clean-install-windows-10-a.html

Nice to be able to solve it myself : )


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Question Info

Last updated January 14, 2024 Views 9,150 Applies to: