installing with UEFI/GPT - 1803 build

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  1. Posts : 12
    windows 10 64 bit Pro
       #1

    installing with UEFI/GPT - 1803 build


    trying to install a UEFI/GPT setup, but keep getting "unauthorised changes on firmware/OS or UEFI drivers" message.

    When i disable CSM/UEFI in BIOS it works but I cant seem to get the installer to create the extra three partitions for a proper install, only one.
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  2. NavyLCDR's Avatar
    Posts : 15,657
    Windows 10 Pro
       #2

    How did you make the USB flash drive you are trying to install from?
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  3. Posts : 12
    windows 10 64 bit Pro
    Thread Starter
       #3

    Rufus 3.3, with the GPT/ UEFI option. and the iso downloaded from microsoft directly
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  4. NavyLCDR's Avatar
    Posts : 15,657
    Windows 10 Pro
       #4

    coinup said:
    Rufus 3.3, with the GPT/ UEFI option. and the iso downloaded from microsoft directly
    Is the USB flash drive formatted as NTFS? If so, that would likely be your problem. I don't recommend that anyone use Rufus to make the flash drive with. It's too easy to get the wrong settings, and it's so much easier to create it with diskpart.

    The flash drive should be MBR partitioned with a FAT32 partition marked as active. Then you simply boot it in UEFI mode to install Windows 10 in UEFI mode on the HDD/SSD.
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  5. Ztruker's Avatar
    Posts : 13,551
    Windows 10 Pro X64 21H1 19043.1043
       #5

    I don't know why you say it's easy to get the wrong settings? If you want GPT and UEFI you select it and you're done. I find it much easier than diskpart. This is with version 3.3 and later.

    installing with UEFI/GPT  - 1803 build-image.png
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  6. Kyhi's Avatar
    Posts : 3,601
    Windows 3.1 to Windows 10
       #6

    I have Never found a need for Rufus...
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  7. cereberus's Avatar
    Posts : 12,115
    Windows10
       #7

    Shrink C drive by about 6GB from disk management.

    Create new partition and format as fat32

    Copy files from usb drive to new partition.

    Run setup.exe from sources folder to clean install - no need to boot from usb drive - it will install as uefi..
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  8. Posts : 12
    windows 10 64 bit Pro
    Thread Starter
       #8

    Thanks all for the info.

    It will have to wait until Monday, as i'm away until then. FYI using Rufus with NTFS formatting.
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  9. Bree's Avatar
    Posts : 19,618
    10 Home x64 (21H1) (10 Pro on 2nd pc)
       #9

    Kyhi said:
    I have Never found a need for Rufus...

    Mount the ISO and copy the files to a Fat32 usb prepared with diskpart and its partition marked Active. You then have a universal usb capable of booting both uefi and legacy mbr.
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  10. NavyLCDR's Avatar
    Posts : 15,657
    Windows 10 Pro
       #10

    coinup said:
    Thanks all for the info.

    It will have to wait until Monday, as i'm away until then. FYI using Rufus with NTFS formatting.
    That's more than likely the issue. Most computers will not boot from an NTFS partition in UEFI mode. And that's why I state that Rufus has too many confusing options. No options at all are required. As @Bree stated, a Windows 10 installation USB flash drive, partitioned as MBR, with a FAT32 partition marked as active will boot in any mode, legacy BIOS, CSM, or UEFI. It will install Windows based upon the mode in which it is booted.
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