Clevo N870HP6 - files attached

[g-rynar]

Why this option is available in BIOS? Is it possible that this BIOS doesn't have CSM?

[Lost_N_BIOS]

That's "Text" to be shown when CSM is disabled, see at top, there you enable/disable CSM. When disabled, those last two items will be shown on that BIOS page either when viewing immediately or when selecting CSM setting itself. Leave both those last two to default, then they will only be visible in BIOS when CSM is disabled, when CSM enabled they will not be shown.

[g-rynar]

Ok.. One more thing.. Some BIOS have Windows 7 under OS Select as on the picture. In this place I've got only Windows 8/Other. Is it possible to add this option (restore it)? https://ibb.co/gika4f

[genius239]

Ok.. One more thing.. Some BIOS have Windows 7 under OS Select as on the picture. In this place I've got only Windows 8/Other. Is it possible to add this option (restore it)? https://ibb.co/gika4f

I think "others" contain windows7  ,what do you think .

[Lost_N_BIOS]

Yes, win8/Win10 or other, other means XP, Vista, Win7 (Any non-UEFI/Secure Boot enabled OS)

[g-rynar]

So, why I'm trying to install Windows 7 with Other compatibility setting and csm enabled I still get error: "BIOS is not fully ACPI compliant". Have you got any ideas?

[Lost_N_BIOS]

Sounds like maybe an install source error, is this an edited Win7 installer image?

What all options do you now have set on the page shown in the above image at post #41? And, you have UEFI Boot disabled now correct?