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Switch Windows to UEFI mode without reinstalling Windows.

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PikaaxYT -  

Hello, I'm considering upgrading to Windows 11 as the end of updates for Windows 10 is approaching, but the problem is that when I installed Windows, I did it in MBR and now I can't switch to Windows 11. When I searched on Google for how to switch to UEFI, I was told that Windows wouldn't boot anymore and that I would have to reinstall Windows. Is it possible to switch to UEFI without reinstalling Windows?

Thank you in advance,

1 answer

  1.  fabul Moderator

    Hello,

    A very short, but easy-to-follow summary

    > Settings
    > Updates & Security
    > Recovery
    > Restart

    In recovery mode
    > Troubleshoot
    > Command Prompt

    mbr2gpt /validate
    mbr2gpt /convert

    After that, you will need to switch your BIOS to UEFI (Non CSM) to be able to boot

    1. epango

      Are you sure that Mr. or Mrs. Everyone understands what you are advocating?

    2.  fabul Moderator
      @epango

      You need to click everywhere there is a >

      > Settings
      > Updates and Security
      > Recovery
      > Restart
      > Troubleshoot
      > Command Prompt

      Enter command #1 mbr2gpt /validate
      Then command #2 mbr2gpt /convert

      Switch the BIOS to Non CSM or UEFI mode

      These are the notes I took when I did it, and it worked.

      How can I be clearer and more concise at the same time?

      Have a good day.

    4.  fabul Moderator
      @SATS_fr

      I have 2 NVMe SSDs and 4 HDDs and it worked right away for me, but this is not to criticize your info, indeed, some may experience issues, it can help.

      And indeed, sometimes even Windows' WinPE can't find C;\...

      @+