Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 13,545
    Windows10
       #50

    ArnoldLayne said:
    It's about time Windows included this tool. Worked perfectly for me. I was searching the internet for a way to do this without having to wipe my OS drive and re-partition or purchasing a pro version of a partitioning tool.
    It was not that difficult to do. You basically had to image backup current C drive, then clean install Windows 10 as UEFI, then restore image overwriting c drive, making sure you had all the right files in c:\windows\boot directory (I copy that directory from clean install to a backup drive just in case). However, no need to do that anymore if running 1703.
      My Computer


  2. Posts : 25
    Windows 10 Home 1703
       #51

    cereberus said:
    It was not that difficult to do. You basically had to image backup current C drive, then clean install Windows 10 as UEFI, then restore image overwriting c drive, making sure you had all the right files in c:\windows\boot directory (I copy that directory from clean install to a backup drive just in case). However, no need to do that anymore if running 1703.
    Not difficult, but time consuming. Took less than a few minutes to run mbr2gpt, reboot, and change bios to UEFI.
      My Computer


  3. Posts : 13,545
    Windows10
       #52

    ArnoldLayne said:
    Not difficult, but time consuming. Took less than a few minutes to run mbr2gpt, reboot, and change bios to UEFI.
    Sure but mbr2gpt only works with W10 version 1703. You can use a 1703 installtion drive though to convert older versions.
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  4. Posts : 9
    Windows 10 Pro 64-bit
       #53

    I realize it's recommended to install a new OS when changing mainboards rather than keeping your current installation and just installing new drivers, but I've done it before and intend to do it again.

    I can't see why adding a BIOS to UEFI conversion to the mix would be problematic, but has anyone tried this before? Should just be a matter of running the conversion, then swapping out CPU/mainboard/RAM, then booting up the new rig in UEFI.
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  5. Posts : 61,471
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #54

    Hello Ralphus, and welcome to Ten Forums. :)

    As long as everything in the red warning box at the top of the tutorial checks out ok, you shouldn't have any issues converting to UEFI.

    Of course, I would always recommend to back up anything that you do not want to lose first to be extra safe.
      My Computers


  6. Posts : 9
    Windows 10 Pro 64-bit
       #55

    Thanks for the welcome, and the reassurance. :)
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  7. Posts : 4
    Windows 10
       #56

    Thanks, works fine with an Intel 600P 256GB m.2 SSD Windows 10 1703 with Asus Prime B250 Plus motherboard 0808 bios.
      My Computer


  8. Posts : 5
    Windows
       #57

    Wishing I hadnt tried this, now wont boot. Had a perfectly good running ASUS K60IJ, am hoping someone can help. I could not find the uefi option in the bios. Cant boot from windows 10 or linux flash drive either. After the splash screen all i see is in the attachment.

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-ncm_0014.jpg
      My Computer


  9. Posts : 61,471
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #58

    Hello @DaLee, and welcome to Ten Forums. :)

    Check to see if you may have a "CSM" type setting instead to disable in your UEFI firmware settings.
      My Computers


  10. Posts : 5
    Windows
       #59

    Thanks for responding Brink. Looks as if this PC does not have uefi firmware settings only bios, came with windows 7 originally. Was finally able to figure how to boot from flash drive at a cold boot after changeing a few settings in bios and video taping the display to catch the text on the screen as it flew by.

    Is there a chance of a bios upgrade that may give the uefi option needed? Am looking now for newer version, wasnt any during the free W10 update. Currently has AMIBIOS Version 206

    In a worst case scenario would a fresh install get me back to mbr ok?

    Would there be a command prompt to revert back without losing data?

    Or does this not work at all...
    Convert GPT drive into MBR using Command Prompt (cmd).
      My Computer


 

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