Configuring BIOS in readiness for a switch to UEFI

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  1. Posts : 171
    Windows 10
       #1

    Configuring BIOS in readiness for a switch to UEFI


    Hi. I'm thinking of doing a clean install using UEFI. I've only ever had BIOS before and a snap of it is attached. In the section called Boot Device Control, it seems logical that I would set it to 'UEFI only' but perhaps there's a reason to choose 'UEFI and Legacy OPROM' which would you suggest?

    Also, because my Media Creation Tool is on a USB stick, I presume I have to configure the section called Boot from Storage Devices? If so, is it 'UEFI driver first' or the 'dual' option?

    Many thanks.
    Configuring BIOS in readiness for a switch to UEFI-uefi-bios.jpg
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  2. Posts : 7,484
    Windows 10 Home 20H2
       #2

    I use an ASUS motherboard as you do, and I was still using BIOS early this month as you are now.
    Nine days ago I clean installed Windows in UEFI mode, and I did not have to change anything in the compatibility support module before installation. I just had to set 'Windows Boot Manager' as the first boot device after installation; otherwise Windows could not be started.
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  3. Posts : 12,732
    Windows 11 Pro
       #3

    If you will set the BIOS to defaults, Asus bios usually is set, by default, to recognize either Legacy or UEFI.
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  4. Posts : 7,484
    Windows 10 Home 20H2
       #4

    dortmunder said:
    my Media Creation Tool is on a USB stick
    You don't need MCT but setup files to perform clean installation.

    PS I guess the OP doesn't know s/he can simply press F12 to use 'Print Screen' on an ASUS motherboard, as shown below.

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  5. Posts : 171
    Windows 10
    Thread Starter
       #5

    Sorry, I meant that my bootable USB drive was made with the MCT.
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  6. Posts : 7,484
    Windows 10 Home 20H2
       #6

    dortmunder said:
    I presume I have to configure the section called Boot from Storage Devices?
    I only had to press F8 to enter the boot menu and select 'UEFI : PNY OU3 3.0'.
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  7. rpo
    Posts : 26
    Windows 10 Pro
       #7

    Make sure your USB stick is fat32 for UEFI boot.
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  8. Posts : 7,484
    Windows 10 Home 20H2
       #8

    dortmunder said:
    Sorry, I meant that my bootable USB drive was made with the MCT.
    My USB drive was made bootable by DiskPart.
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  9. Posts : 13,676
    Windows10
       #9

    Use the media creation tool and usb will be bootable on uefi or legacy bios.
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  10. Posts : 12,732
    Windows 11 Pro
       #10

    Some suggestions, Disconnect all hard drives except the one you want to install Windows on. When you boot up and see the Asus logo start tapping F8. You have to be quick or it will boot into Windows. You will have 2 entries in the boot menu. If you were using a Sandisk USB drive, you would see Sandisk USB drive and UEFI Sandisk USB drive. If you want to install in UEFI mode, pick the UEFI Sandisk USB. The other one will install in legacy mode. Make sure you have a backup of all of your personal data first. When you get to "Where do you want to install Windows" use the advanced options and delete all Partitions on the drive until is says 'Unallocated'. Then you can click next and the install will begin.
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