Windows 10: Can’t get out of a bios loop after changing OS type to windows Uefi mode in secure boot

Discus and support Can’t get out of a bios loop after changing OS type to windows Uefi mode in secure boot in Windows 10 Installation and Upgrade to solve the problem; When I change my settings back to default I am unable to get out of this bios loop, this is the setting that I changed to cause this.... Discussion in 'Windows 10 Installation and Upgrade' started by Foti Koutsouli, Apr 27, 2025 at 1:17 PM.

  1. FOTI KOUTSOULI
    Foti Koutsouli Win User

    Can’t get out of a bios loop after changing OS type to windows Uefi mode in secure boot


    When I change my settings back to default I am unable to get out of this bios loop, this is the setting that I changed to cause this.

    :)
     
    Foti Koutsouli, Apr 27, 2025 at 1:17 PM
    #1
  2. NEWTEKIE1
    newtekie1 Win User

    Windows 8 Secure Boot Feature: Not So Secure?

    • Linux
    • Linux
    • Linux
    • Linux
    • Oh and OSX
    Here is a statement from a Kernal Developer at Red Hat:

    I'm not sure this exploits the legacy BIOS but rather it exploits the legacy boot method on MBR drives, injecting a signed key before the OS boots, which you are correct in that it has nothing to do with Windows 8. And the simplest fix would just be to require boot drives use GPT when Secure Boot is enabled in UEFI.
     
    newtekie1, Apr 27, 2025 at 1:23 PM
    #2
  3. MAGNUS_975
    Magnus_975 Win User
    Failing to install Windows 10 in UEFI boot mode

    Hi

    I’ve been reading articles in this community and others the last couple of days and I’m getting more and more confused.

    I have made my first build with the following equipment:

    Asus Prime Z370-P (Bios version 1002x64, firmware 11.8.50.3470)

    Intel Core i5 8400 2,8GHz

    Samsung 860 EVO Series MZ-76E250B 250GB

    and other..

    I purchased a Windows 10 Home Eng Retail licence on USB directly from Microsoft.

    When installing Win 10 it always ends up being installed in Legacy BIOS mode.

    First time, I only followed the instructions on screed and had a successful installation, but in Legacy Bios mode.

    The second time I made the following change the UEFI:

    Boot\Secure boot\OS type = Windows UEFI mode

    Installation was still being made in Legacy Bios mode.

    Third time

    Boot\Secure boot\OS type = Windows UEFI mode

    When Win 10 installation started I entered the cmd prompt and made the following commands in order to change to gpt

    Diskpart

    List disk

    Select disk 0

    convert gpt

    Exit

    I then continued with Windows installation which still ended up in Legacy Bios mode.

    I’m getting crazy and I don’t know what I’m going to do : (

    What do I need to change in the UEFI?

    What do I need to do to prepare the disk for UEFI mode?

    Is my purchased Windows 10 USB key prepared for UEFI mode?

    Can someone describe, step by step what I need to do?
     
    Magnus_975, Apr 27, 2025 at 1:23 PM
    #3
  4. DAMN_SMOOTH
    Damn_Smooth Win User

    Can’t get out of a bios loop after changing OS type to windows Uefi mode in secure boot

    Windows 8 Secure Boot Feature: Not So Secure?

    So Linux is switching to secure boot also? Or they have to because of UEFI?
     
    Damn_Smooth, Apr 27, 2025 at 1:23 PM
    #4
Thema:

Can’t get out of a bios loop after changing OS type to windows Uefi mode in secure boot

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