Windows 10: Lost UEFI when reinstalling Windows 10

  1.    30 Apr 2017 #1

    Lost UEFI when reinstalling Windows 10

    I have a laptop that had Windows 7, but was upgraded to Windows 10 with the free upgrade option.

    Everything was getting really slow and full of unneeded software, so I decided to do a clean reinstall Windows 10. I downloaded a copy of Windows 10 to a USB drive as directed here: Download Windows 10

    But I couldn't boot from the USB drive unless I turned off UEFI and the "secure mode" settings, and instead used the legacy BIOS boot settings without "secure mode".

    I then deleted all partitions and reinstalled Windows 10 on the new blank memory.

    Eveyrthing went fine, but when I try to change the settings back from legacy BIOS to UEFI it says there is nothing to boot. It only works when in legacy BIOS mode.

    I want my installation to be very secure from hacking, so how can I reinstall the UEFI settings so I can turn the secure mode back on?

    I have no idea how all this stuff works - but from Googling I think I messed up by deleteing the partition that held the UEFI setting. Any way I can reconfigure that and fix what I did?
      My ComputerSystem Spec

  2. WOT's Avatar
    Posts : 471
    Win 10 Pro 15063.332 (ex-Insider)
       30 Apr 2017 #2

    Your installation media apparently was not UEFI bootable.

    Follow these instructions to create a bootable Windows 10 USB drive for Legacy BIOS and/or UEFI:
    Create Bootable USB Flash Drive to Install Windows 10

    2. Set your BIOS to UEFI defaults then disable Secure Boot and Fast Boot (if enabled):
    (You can turn those 2 options back on after the installation is completed)

    3. Select the UEFI option when booting from the new media and away you go!

    Good luck,

      My ComputersSystem Spec

  3.    30 Apr 2017 #3

    I do believe you made the error of selecting the first one (BIOS or UEFI). It won't boot in UEFI, <<no boot device was found>> will be shown. You will get the same result with Ubuntu or Opensuse. Second and third option works.
    Attached Thumbnails Attached Thumbnails UEFI.PNG  
      My ComputerSystem Spec

  4.    30 Apr 2017 #4

    Got it working thanks guys!

    I used the same boot USB I had before, but this time I selected UEFI for installation in the boot menu. I must have misse that somehow the first time around.
      My ComputerSystem Spec

  5. WOT's Avatar
    Posts : 471
    Win 10 Pro 15063.332 (ex-Insider)
       01 May 2017 #5

    That's great news! Glad you got it sorted and thanks for reporting you fix too!

    Please mark this thread as solved.


      My ComputersSystem Spec


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