Hybrid (UEFI / MBR) ISO's -- UEFI BOOT (CSM)

  1. jimbo45's Avatar
    Posts : 9,106
    Windows / Linux : Arch Linux

    Hybrid (UEFI / MBR) ISO's -- UEFI BOOT (CSM)

    Hi folks
    recently I couldn't get some newer iso's from UUPDUMP to boot using RUFUS V 10 to create bootable usb sticks when these isos are HYBRID boot (i.e they can boot either MBR or UEFI).

    However changing the BIOS options to enabling UEFI boot (CSM module) as well as UEFI then it all worked OK -- I had CSM disabled previously but hadn't needed it so far.

    Anybody know what this CSM thing is

    It's an older MOBO which can also boot MBR (legacy) but the bios setup has to be entered and changed.

    I don't see any problems on a more modern laptop

    I thought the CSM module was only something to do with UEFI boot for Windows 7 but obviously I'm wrong

    Any gurus here who can explain what it is.

      My Computer

  2. RoadBlaster's Avatar
    Posts : 301
    Win 10 Pro Dual Boot


    The Compatibility Support Module (CSM) is a component of the UEFI firmware that provides legacy BIOS compatibility by emulating a BIOS environment, allowing legacy operating systems and some option ROMs that do not support UEFI to still be used. ... Most BIOSes have a keyboard shortcut to reset to factory default settings.
      My Computer

  3. NavyLCDR's Avatar
    Posts : 13,232
    Windows 10 Pro

    What @RoadBlaster stated. CSM is Legacy BIOS emulation in UEFI firmware.
      My Computer


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