Windows 8 and 8.1 Forums


Can I turn a Win8 installation for UEFI into CSM-Mode Win8

  1. #1


    Posts : 17
    Windows 8

    Can I turn a Win8 installation for UEFI into CSM-Mode Win8


    On my computer there is a pre-installed Windows 8 which works fine for
    UEFI boot (Secure boot not necessary).

    Now when I switch in UEFI setup at boot time the UEFI mode into the CSM (BIOS) mode
    and restart then Windows 8 is not starting any more.

    As far as I find out an UEFI-based Windows 8 can only boot with UEFI mode enabled.

    So my question is: Can I turn an existing UEFI based Windows 8 installation into
    an CSM/BIOS based installation (=a Win8 which boots successfully even when I enable CSM in UEFI setup) ?

    If yes: How do I do that?

    Peter

      My System SpecsSystem Spec

  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    What OS are you trying to install?

    Your other thread is about dualing booting Windows 7 & 8,
    Can I boot with one Bootmanager Win 8 and Win7?
    Windows 7 & 8 will dual boot in UEFI mode.
      My System SpecsSystem Spec

Can I turn a Win8 installation for UEFI into CSM-Mode Win8
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