Change boot back from efi to mbr

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  1. Posts : 6
    Windows 10
       #1

    Change boot back from efi to mbr


    A quick explenation to my problem, so I formated a drive with an old windows installation on it (not the one qurently in use) and it hade my boot records on it, so I got the error bootmgr missing. So a bit panicked I used the first solution witch was "bcdboot c:\windows /s h:" from the command prompt from a USB with a windows ISO on it. That fixed it and I could now boot in to windows and everyting worked.

    But this made it so i'm booting with EFI insted of MBR. So i'm booting with a boot option on my H: drive witch is not my windows instalation drive witch is C:. The C: drive is MBR and the H: drive is GPT. Is there a way to fix it so that I can choose my C: drive in the bios to boot from. So remove the efi and use mbr instead.
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  2. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #2

    First, we need to see a screenshot of disk management:
    Disk Management - How to Post a Screenshot of

    Make sure to widen the data columns so we can see all the data.

    Also, just curious, what is the issue with booting in UEFI mode?
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  3. Posts : 6
    Windows 10
    Thread Starter
       #3

    Here is the picture
    Change boot back from efi to mbr-disks.png

    C: is where my windows is and F: is where my EFI folder is.
    It's is not a problem to boot with this method, it's more that I want the boot records to be on the C: drive as well.
    Sorry if this was not clear from my first post. And the boot record is located as a normal folder on disk F:.
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  4. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #4

    The command would be:
    bcdboot C:\Windows /s C: /f BIOS

    Then reset your UEFI settings to boot from Disk 0 in legacy BIOS (CSM) mode.
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  5. Posts : 6
    Windows 10
    Thread Starter
       #5

    Can I use this command from a cmd inside windows or should I use it from a ISO on a USB?
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  6. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #6

    Inside Windows
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  7. Posts : 6
    Windows 10
    Thread Starter
       #7

    I copied that command in to a cmd inside windows and then restarted my computer and went in to the bios. But my C: drive is still not recognised as a bootable drive.
    Change boot back from efi to mbr-rsz_dsc_0126.jpg
    Only my F drive is recognised as a bootable drive (both in the picture).
    I have my bios set to recognise both UEFI and legacy boot devices.
    THe mother board in question is a "Asus ROG Strix X570-F Gaming" if that helps.

    Edit: Both the C: disk and the F: disk is mbr, a correction to the original post.
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  8. NavyLCDR's Avatar
    Posts : 15,515
    Windows 10 Pro
       #8

    Run:

    bcdboot C:\Windows /s C: /f ALL
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  9. Posts : 6
    Windows 10
    Thread Starter
       #9

    When I copy that command in to a CMD I get the error "Failure when attempting to copy boot files".

    Edit: From inside windows.
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  10. Ztruker's Avatar
    Posts : 13,512
    Windows 10 Pro X64 20H4 19042.746
       #10

    Elevated Command Prompt, yes
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