1.    07 Sep 2015 #1
    Join Date : Aug 2015
    Posts : 31
    Windows 10

    Convert MBR disk to GPT via uefi shell?


    Hello!

    I did something terrible to my tablet, I converted the partition from GPT to MBR in a desperate try to install windows 7.

    Now tablet is not reading any usb I plug in, and of course I cannot format disk again because it doesn't recognize anything, always booting at uefi shell.

    Anything I can do to fix it?

    Thank you so much!
      My ComputerSystem Spec
  2.    08 Sep 2015 #2
    Join Date : Aug 2015
    Posts : 3
    Windows 10 pro x64, 7, Mint, Ubuntu

    try entering your tablets bios (you will need to check your tablet manufacures instructions usualy on their website for how to access the bios)
    and change from UEFI to legacy
    iirc usb devices will only boot from legacy bios.. at least mine does

    you can change the disk type from MBR to GPT using the commandline (DOS) using diskpart assuming you can either boot to windows or the windows recovery environment from USB\DVD see here (iirc this works with w7 and up)
    Change a Master Boot Record Disk into a GUID PartitionTable Disk
    once done switch back to UEFI

    imho if your not sure what your doing you may be better off wiping the disks and starting again
    Last edited by finglonger; 08 Sep 2015 at 11:00.
      My ComputerSystem Spec
  3.    08 Sep 2015 #3
    Join Date : Aug 2015
    Posts : 31
    Windows 10
    Thread Starter

    Quote Originally Posted by finglonger View Post
    try entering your tablets bios (you will need to check your tablet manufacures instructions usualy on their website for how to access the bios)
    and change from UEFI to legacy
    iirc usb devices will only boot from legacy bios.. at least mine does

    you can change the disk type from MBR to GPT using the commandline (DOS) using diskpart assuming you can either boot to windows or the windows recovery environment from USB\DVD see here (iirc this works with w7 and up)
    Change a Master Boot Record Disk into a GUID PartitionTable Disk
    once done switch back to UEFI

    imho if your not sure what your doing you may be better off wiping the disks and starting again
    Thanks for reply!!

    But my tablet don't have a legacy option :/.....

    I can't enter on windows, neither on recovery, bios always booting the uefi shell, and every usb I plug (with windows on it) tried w7,w8,w10 .. not recognizing any usb.
      My ComputerSystem Spec
  4.    08 Sep 2015 #4
    Join Date : Aug 2015
    Posts : 611
    W10 Home 1703

    It would be helpful to know the brand and model number of your tablet.
      My ComputerSystem Spec
  5.    09 Sep 2015 #5
    Join Date : Aug 2015
    Posts : 31
    Windows 10
    Thread Starter

    Quote Originally Posted by TV2 View Post
    It would be helpful to know the brand and model number of your tablet.

    The brand is spanish, is UNUSUAL 10W.
      My ComputerSystem Spec
  6.    09 Sep 2015 #6
    Join Date : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3

    Quote Originally Posted by alesyt0h View Post
    The brand is spanish, is UNUSUAL 10W.
    Unusual Tech site
    UNUSUAL 10W - Comodidad y tecnologÃ*a 2 en 1

    There is a recovery image (I think - Mi español no es muy bueno.) in the downloads section at the bottom of the page.
    10W - Imagen de recuperación de sistema

    Click image for larger version. 

Name:	un10w.PNG 
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    The trick is getting it on your tablet - is there any data you need on the device?
      My ComputerSystem Spec
  7.    09 Sep 2015 #7
    Join Date : Oct 2013
    Penns Forrest
    Posts : 3,506
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3

    You might try using Rufus to create Windows Install Media (Win7, Win8, or Win10) from an ISO. Create the flash drive as a GPT / UEFI boot.

    Click image for larger version. 

Name:	14242d1426172275-usb-flash-drive-create-install-windows-10-a-rufus_uefi.png 
Views:	22 
Size:	24.7 KB 
ID:	36588

    I don't know if that will get you to the machine or not, but it's a thought.
      My ComputerSystem Spec
  8.    09 Sep 2015 #8
    Join Date : Aug 2015
    Posts : 31
    Windows 10
    Thread Starter

    Fixed! I upgraded my bios and now USB are recognited !

    Thank you all!
      My ComputerSystem Spec

 


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