Windows 10: BOOTMGR is missing

Discus and support BOOTMGR is missing in Windows 10 Installation and Upgrade to solve the problem; I need to enable Secure Boot to convert my Windows 10 installation to Windows 11. My motherboard manafacturer said my OS was running legacy mode so I... Discussion in 'Windows 10 Installation and Upgrade' started by Chris RRRR, Feb 25, 2025.

  1. CHRIS RRRR
    Chris RRRR Win User

    BOOTMGR is missing


    I need to enable Secure Boot to convert my Windows 10 installation to Windows 11. My motherboard manafacturer said my OS was running legacy mode so I should follow the Microsoft article "Convert an existing Windows 10 installation from Legact Bios to UEFI"Point 5 of the pre-requisites says that one of the partitions must be active, so I used Disk Manager to set the C drive to "Active". Now when I start the PC I get "BOOTMGR is missing" and can't get any further.I have a Windows 10 repair disk that wasn't able to repair the installation. I've downloaded new installation media but but that doesn

    :)
     
    Chris RRRR, Feb 25, 2025
    #1
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BOOTMGR is missing

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