(1) Does anyone have an idea on what to change on Windows 11 to be able to suppress this Secure mode? I already spent a lot of time googling on this subject in vain. Also while on Windows, the "shutdown /r /fw" does not reboot on UEFI settings as it should, but on Windows 11 again. And this message appears, according to Microsoft, to the fact that the Secure Boot is still on (which can be verified by msinfo32 or Confirm-SecureBootUEFI). I am able to change it with F10 (and bios password enabled) or by PowerShell with "BiosConfigUtility64.exe /set:Bootdisable.txt /nspwdfile:"mypasswd.bin" but each time the saved config disappears and while rebooting either with ESC or F9, on either a DVD or a USB stick, I get the message "selected boot image did not authenticate". In order to dual boot, I have to change the bios/UEFI Secure Boot to disable (and legacy to enable). I recently bought a refurbished HP Z4 G4 with windows 11 already installed.
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