Can't install w10 update, UEFI error?

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  1. Posts : 36
    Windows 10
       #1

    Can't install w10 update, UEFI error?


    So, I have Windows 10 already installed on my PC. I upgraded it last Summer from Windows 7 for free.

    I've been trying to update it for the past 6 weeks but keep getting the error: "Windows 10 couldn't be installed. Windows can't be installed because this PC has an unsupported desk layout for UEFI firmware."

    I have 3 hard drives and Win10 is running on my main SSD, disk 0. I remember having some funky upgrade issues and needed to unplug certain hard-drives due to strange ownership issues. Heres is a look from Disk Management. I've got an MSI m-board plus BIOS, all new.

    https://i.imgur.com/H5WsiEr.jpg

    Help!
      My Computer


  2. Posts : 5,478
    2004
       #2

    Please post results of:

    diskpart
    list disk
    select disk 0
    list partition

    It looks like your disk may be mbr format.
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  3. Posts : 36
    Windows 10
    Thread Starter
       #3

    Ok here is the info you requested:

    https://i.imgur.com/gFihC4h.jpg
      My Computer


  4. Posts : 5,478
    2004
       #4

    Your disk is mbr not GPT and you don't have a MSR partition.

    You could convert the disk to GPT and create MSR in the unallocated 128MB space (if you want to boot UEFI) or convert your disk layout to legacy. Do you have a preference?

    Someone else had this exact same problem a couple of days ago - I will see if I can find the thread. In the meantime what does your BIOS say? Legacy boot or UEFI?
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  5. Posts : 36
    Windows 10
    Thread Starter
       #5

    lx07,

    thanks for your help! Ok. I'm a bit of a noob with UEFI and BIOS related things, so I'm going to ask what you think I should do. I primarily use my PC as a gaming machine.

    I just checked - it's Legacy + UEFI now. I have the option of UEFI only as well.

    P.S. if I convert to GPT, does that wipe all my data? Rather be able to fix this without having to do a clean install of W10.
      My Computer


  6. Posts : 5,478
    2004
       #6

    I think it doesn't matter. I changed to EFI boot about 6 months ago as it was allegedly faster to boot but I noticed no difference.

    Your problem is you are stuck in a sort of limbo. You have an almost UEFI disk layout but are booting legacy.

    This was the other thread btw Cannot upgrade due to unsupported disk layout for UEFI firmware - Windows 10 Forums

    I would pick one approach and stick to it. So assuming EUFI the steps would be:

    1. Make sure you have a bootable USB with Windows 10 on (in case you end up needing to repair boot files).

    2. Make a backup.

    3. Convert your disk 0 from MBR to GPT using MiniTool Partition Wizard (this is quite easy - just click on the convert mbr to gpt button and you shouldn't lose any data).

    EDIT This is the button I mean (but the other way around - mbr to gpt)... Then click "Apply"

    Can't install w10 update, UEFI error?-capture.png

    4. Create the msr partition as described in this post How to recreate a Microsoft Reserved Partition for GPT volumes on AppAssure Agents (137589). For you the offset is 229-128 = 101 so you would enter
    Code:
    diskpart
    select disk 0
    create partition msr offset=101
    5. Change partition one (your 100 MB EFI partition) attributes to EFI
    Code:
    diskpart
    select disk 0
    select partition 1
    remove
    set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b override
    6.. Create boot files (from elevated command prompt not diskpart)
    Code:
    bcdboot C:\Windows
    Then try to reboot and see if it works. If it does then you are running UEFI and the upgrade should work OK.
    Last edited by lx07; 23 Dec 2015 at 18:41. Reason: Added picture
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  7. Posts : 36
    Windows 10
    Thread Starter
       #7

    Ok I think I will try the UEFI method you suggested and outlined. When you say "backup" for step number 2, are you referring to all my data on my current Drive 0? And how should I back that up? Is it possible to back it up on either of my other 2 hard drives?

    thanks.
      My Computer


  8. Posts : 5,478
    2004
       #8

    DiscoSlice said:
    Ok I think I will try the UEFI method you suggested and outlined. When you say "backup" for step number 2, are you referring to all my data on my current Drive 0? And how should I back that up? Is it possible to back it up on either of my other 2 hard drives?

    thanks.
    Yes. There is a chance something goes wrong so if there is anything important you should save it to another drive. Either D or E would be fine. You could use Macrium (or anything else) to make an image.

    Partition Wizard has always been reliable for me but you never know. More likely than losing data is system will not boot as creation of boot files was incorrect somehow. This is not serious if you have a bootable USB.

    However when I converted from MBR to GPT it was all quick and easy so hopefully it will go OK - just better to be safe.
      My Computer


  9. Posts : 36
    Windows 10
    Thread Starter
       #9

    Ok i will do that then. Should I just use Windows backup to do that?

    Also, where can I get a Win10 ISO for my USB?
      My Computer


  10. Posts : 5,478
    2004
       #10

    DiscoSlice said:
    Ok i will do that then. Should I just use Windows backup to do that?

    Also, where can I get a Win10 ISO for my USB?
    I would use Macrium from the link above as it is much quicker than the built in system image but either is fine.

    You can download and automatically create a bootable Windows USB using the media creation tool as described in option 1 here USB Flash Drive - Create to Install Windows 10 - Windows 10 Forums

    You'll need a USB key with nothing you want on it which is at least 4GB.

    It isn't 100% required to make a bootable usb before you start but if something does go wrong and you can't boot you'll have to make one on another PC so it might make life easier to do it first.
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