Hi Thierry, I understand this can be confusing. Are you able to see Secure Boot and Platform Key options in your BIOS?
To enable Secure Boot for Windows 11:
- Set OS type to Windows UEFI.
- Disable CSM.
- Enable Secure Boot.
- If asked, choose “Install Default Secure Boot Keys” or “Enroll All Keys.”
- Save and restart.
If it still won’t turn on, update your BIOS from Gigabyte’s official site to support Windows 11.
Best regards, Arlene D.