Windows 8 and 8.1 Forums


Fail to boot in UEFI after installing in MBR

  1. #1


    Posts : 54
    windows 8 pro 64bit

    Fail to boot in UEFI after installing in MBR


    I just install windows 8 using BIOS , but now i want to change it to UEFI boot. so i followed steps below


    1.create and format a new FAT32 partition K:
    2.my windows8 is in I: so , i use this command bcdboot i:\windows /f all /s k: and succeeded.
    3.i checked with the bootice about the BCD in my K: and found it indeed point to i:\windows\ just like the picture below
    https://1ke1pq.dm2302.livefilestore....Y/5.jpg?psid=1




    4. and i restart, choose uefi boot in BIOS configuration and it showed like this:
    https://cbzpmw.dm2301.livefilestore....o/1.jpg?psid=1




    5. i checked my k:/windows/system32/ , there is a winload.efi file...
    https://1ke1pq.dm2302.livefilestore....Y/5.jpg?psid=1


    The most strange thing is that i've copyed my winload.efi to other computer which is already in UEFI mode , and also i've copyed it in my virtual machine, it works fine! So my winload.efi should be OK. Then what the hell is it going on?


    anyone who can give me a suggestion?

      My System SpecsSystem Spec

  2. #2


    Yes, Use Diskpart to Clean your disk convert it to GPT and install UEFI. I don't think you can convert a OS Booting BIOS MBR disk to UEFI GPT and get it to boot.
      My System SpecsSystem Spec

  3. #3


    Posts : 54
    windows 8 pro 64bit


    But actually i did it in my virtual machine , booting in UEFI mode while it's MBR...
    And my friend also did it on his computer, the same steps as mine...
      My System SpecsSystem Spec

  4. #4


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    This is for Windows 7.
    If you have Windows 7 installed, & two HDD's, you can clone Legacy to UEFI.
    Migrate BIOS x64 install to UEFI. Solved - Windows 7 Help Forums
    There is a Windows 8 version.
      My System SpecsSystem Spec

  5. #5


    Posts : 54
    windows 8 pro 64bit


    Actually i don't have a second hard disk..
    what's more... i just want to boot UEFI in my MBR, not copy my system to another hard disk
      My System SpecsSystem Spec

  6. #6


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    UEFI = GPT set up boot HDD.

    Legacy = MBR set up boot HDD.
      My System SpecsSystem Spec

Fail to boot in UEFI after installing in MBR
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