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"Unable to access Windows due to 'secure boot violation' message"

Walloute -  
Malekal_morte- Posted messages 178136 Registration date   Status Moderator, Security Contributor Last intervention   -
Hello,

I have an Asus x7751L, Windows 10
During a startup, I received a message:
“SECURE boot violation
invalid signature detected. Check secure boot policy in setup”

Since then, I have disabled the secure-boot option in BIOS.
Now, when I try to start it, the screen stays stuck on the Asus logo.

In the Boot Option Priorities, there are 3 options:
windows boot manager (P0: *string of characters*)
P1: *string of characters*
P0: *string of characters*

I changed this order, but it doesn’t change anything.

I tried to boot with a USB drive made with the tool downloadable from the Microsoft site to create an installation medium, hoping to eventually get to the Repair your computer > Troubleshoot > Advanced options > System Restore option, because I have work-related data on this computer that I really want to recover. But the BIOS does not recognize my USB drive.

I don’t know what to do anymore, and I would not have dared to ask for help before spending 3 days searching through several forums.
If anyone has any ideas, that would be great, thank you :)

2 answers

  1.
    Malekal_morte- Posted messages 178136 Registration date   Status Moderator, Security Contributor Last intervention   24 712
     
    Hi,

    You can disable secure boot in the BIOS options, see: https://www.malekal.com/comment-desactiver-le-secure-boot/

    But normally it's not necessary.

    Your secure boot violation message may be due to the fact that your USB key is incorrect.
    You need a 8 GB USB drive to put the Windows installer on it.
    This is especially true if you encounter errors 0x800... during installation.

    In this case:

    Redo your USB stick with Media Creation Tool: https://www.microsoft.com/fr-fr/software-download/windows10

    If that doesn't work, try making one again with Rufus: how to download Rufus.
    Download the ISO file, for example with Adguard: Download Windows ISO
    Launch Rufus and then specify the ISO file
    In partition type, choose GPT.
    For more details, refer to this tutorial for details: how to create a bootable USB drive for Windows installation

    2
    1. Walloute
       
      Thank you Malekal_morte-
      indeed, by choosing GPT for the partition type, the key works.
      So I launched that and selected "repair the computer > troubleshoot > advanced options > system restore"

      I waited for it to restore with a restore point from 02/05, then it asked to restart, and it still brings me back to the fixed Asus logo. Nothing happens.

      Thank you very much for your help
      0
      1. Malekal_morte- Posted messages 178136 Registration date   Status Moderator, Security Contributor Last intervention   24 712 > Walloute
         
        Completely reinstall Windows 10, it’s the best option.


        Follow this tutorial that explains how to install Windows 10: how to install Windows 10.
        All the steps are provided from A to Z with tips at the end to secure Windows 10.
        • Let yourself be guided to install Windows 10.
        • Choose custom (not upgrade)
        • During the partition phase, select the main partition and click next.


        • The installer will inform you that Windows is already present and will propose to move it.


        • Follow the Windows installation procedure using the tutorial above.


        Just don't format.

        Your user data will be copied into the Windows.old folder.

        Once Windows is installed, I recommend following these tips to properly configure and use Windows: Tips after reinstalling Windows.
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    2. Walloute Posted messages 1 Status Member
       
      Thank you very much!
      I will do that
      What does "user data" include?
      I have a lot of ongoing projects on my desk (I am a graphic designer). Am I going to lose files?
      0