I was trying to reinstall W11 and I can't get Secure Boot config to work in supported way.

Basically, as I understand for Secure Boot to work CSM has to be disabled in BIOS. However, if I disable CSM, then M.2 drives instantly disappears (I can see they are still connected as they are listed in drive menu), but I can't boot from them and I can't install anything into them, they basically do not exist from operating system perspective and even from BIOS booting perspective.

If I enable CSM, then I instantly get error from W11 installer that my system "does not meet minimum requirements", also in Windows when I check Secure Boot status - it says "unsupported".

So what is the correct way of setting-up bios for W11? How I suppose to make M.2 drives available and correctly recognised with CSM disabled? Or how do I suppose to make W11 set-up recognise Secure Boot, whilst CSM is enabled?

I guess question in summary - what is correct BIOS set-up for W11 installation and booting.

e.g. what CSM should be set at? enabled or disabled? What about other settings - should they be UEFI or legacy?

What should I select in secure boot section - Windows UEFI or Other OS? Should I do anything with key management?

Is there anything specific I have to do on drive itself? Like how I suppose to add UEFI boot partition on drive? Besides it seems that my main drive has UEFI boot partition, because when I check boot drives it says "UEFI : Windows Boot Manager drive M.2_1 [drive name]". yet still as soon as CSM is disabled my boot menu is totally empty.

P.S. - yes I know it is odd that PC already runs W11 and it basically updated itself (one day I just got pop-up saying do you want to configure W11 or continue using W10 and I just agree to upgrade it to W11) and never complained about nay support issue. And also I have not changed any BIOS settings since and now W11 set-up is complaining about compatibility, so I assume something on W11 side has changed and perhaps it is partially Microsoft issue of not being able to correctly identify that system is actually compliant. But the point is still valid - even in BIOS tips it says "disable CSM for secure boot", but it just isn't clear how you suppose to boot at all if without CSM M.2 drives just disappears.

So I'm kinda getting frustrated as the 5800x is a supported CPU and even the motherboard is listed as compatible.. I have Firmware TPM enabled as well as Secure Boot but every time I try to install Windows 11 I am getting "This PC does not meet the minimum requirements"

Anyone got ideas?

This is a brand new system btw.