Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 7
    Windows 10
       #160

    Brink said:
    Short of doing a clean install with UEFI directly, you could try doing a repair install of Windows 10 if you didn't want to start over to hopefully fix the above.

    Be sure to disconnect all hard drives other than the Windows drive first.

    Repair Install Windows 10 with an In-place Upgrade

    Afterwards, try to convert again.
    Unfortunately the repair install failed with the same reason:

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


  2. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #161

    explorerv said:
    Unfortunately the repair install failed with the same reason:
    If you don't mind doing a clean install and have backups, doing a clean install with UEFI should work for you.

    Clean Install Windows 10
      My Computers


  3. Posts : 7
    Windows 10
       #162

    Brink said:
    If you don't mind doing a clean install and have backups, doing a clean install with UEFI should work for you.

    Clean Install Windows 10
    That's what I'm trying to avoid as I have to reinstall a lot of software and made a number of tweaks.
      My Computer


  4. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #163

    explorerv said:
    That's what I'm trying to avoid as I have to reinstall a lot of software and made a number of tweaks.
    Just to verify, did you use installation media that supports legacy BIOS and have BIOS set to legacy BIOS (CSM) when doing the repair install?

    Did you already try extending the Windows partition into the unallocated space to remove it?
      My Computers


  5. Posts : 7
    Windows 10
       #164

    Brink said:
    Just to verify, did you use installation media that supports legacy BIOS and have BIOS set to legacy BIOS (CSM) when doing the repair install?

    Did you already try extending the Windows partition into the unallocated space to remove it?
    So from the last to the first:
    Yes, I extended the system partition over the unallocated space.
    The installation media is Windows 10 Enterprise x64 downloaded yesterday from Microsoft.
    The CSM is mixed UEFI and legacy as if I set this to legacy only the system won't boot.
      My Computer


  6. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #165

    explorerv said:
    So from the last to the first:
    Yes, I extended the system partition over the unallocated space.
    The installation media is Windows 10 Enterprise x64 downloaded yesterday from Microsoft.
    The CSM is mixed UEFI and legacy as if I set this to legacy only the system won't boot.
    I asked because your Disk Management screenshot still showed the unallocated space.

    It is required to have the exact same edition, version, and language of Windows 10 installation media for what you currently have installed to do a repair install.

    Do you currently have the Enterprise edition installed?
      My Computers


  7. Posts : 7
    Windows 10
       #166

    this is the current picture:

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-diskmanager.jpg

    The article says:
    The installation media (ex: ISO or USB) must be the same edition and same or newer build as your currently installed Windows 10. If it's not, then the repair install will fail.

    so I picked the Enterprise edition from the download link mentioned there.

    And yes, my home PC is with Ent edition:

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


  8. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #167

    Ok @explorerv,

    Just had to verify.

    Considering it will not let you convert, I'm not sure of any other method to do so than a clean install when able.
      My Computers


  9. Posts : 7
    Windows 10
       #168

    Thanks for the help anyway :)
      My Computer


  10. Posts : 6
    Win 10
       #169

    Hello! After converting my drive from Legacy BIOS to UEFI using this method (i mean, mbr2gpt / convert / allowfullOS), the "System Reserved" partition of the MBR still exists, and even became drive "E", visible and explorable from My PC (when before, naturally, it was hidden). Can I delete it now that I am in UEFI?

    I briefly comment on the steps I did: First I had to delete partitions because it exceeded 3 and the method was not going to work. They were 3 partitions that I had not voluntarily created, in fact two of them I don't even know how they were there. They were small, blank partitions. I could not delete them either from the Disk Manager, nor with the Diskpart. So I did it with a software, with which I eliminated them very quickly and without problems. Then I also deleted the third extra partition, which was the one that the Samsung software had created on my SSD as "Overprovisining". Then I extended the windows partition to take advantage of the new unallocated storage. So finally I had 2 partitions left: "C:" and the System Reserved (that was hidden). I Then proceeded with the conversion via "mbr2gpt / convert / allowfullOS". For some reason the first attempt failed. It threw me an error but after Googling for a few minutes I didn't find anything clear, so I just tried again, and this second time it worked. I checked in various ways, and i was indeed on UEFI. However, after a while I entered "My pc" and noticed that there was an "E:" System Reserved drive.
    In short, I can delete it, right?
    Here the screenshots, Thank you very much!

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-1.jpg
    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-2.jpg


    PS: Excuse my English and screenshots in Spanish
      My Computer


 

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