System not booting with UEFI, unable to use Secure Boot

[RadosławR]

I've been struggling with enabling Secure Boot with Windows 10. The issue is basically that when I set UEFI in the Windows-specific options of my BIOS, the system gets stuck at the spinning windows dots and MSI logo. It's fine when I go back to CSM in the BIOS.The PC was assembled and had Windows installed some time ago, all in CSM and "UEFI+Legacy" modes. I would like to avoid reinstalling the OS to not lose anything, unless it's necessary to do so. Also, there's no message like "No bootable system", just the spinning dots, so it doesn't seem to me like a reinstall is required (it also is fin

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