What I did (thanks to Nigel Johnstone) is I unplug any Mini SAS cable from the LSI 9271-8i card and just install the card ONLY (NO HDDs ATTACHED) and then plug USB for installing a fresh copy of Windows 10 20H2 or newer) and then do all the installation of drivers including LSI 9271-8i from Broadcom (the official driver site) by entering device manager > find Avago LSI RAID card under the storage controller > manually update the driver (in my case MR Windows Driver - 06.714.18.00 ). After reading a lot of solution including my question on the LTT forum, ( ) instead of installing fresh copy's of Windand then update the driver for the LSI card and then update the Windows 10 to the latest one, I recently successfully installed Windows 10 20H2 without upgrade from the old version of Windows 10. So the problem solved! How do I properly forward this issue to Microsoft etc so they can have a look at it? I would have loved trying to updating to it to see if this would then fail the system again or if it's just the clean install to it that has this problem. However, the 2004 update isn't found by Windows Update. For now only version 1909 has been installed (build 18363.900) and the RAID-card still works and Windows starts. So problem solved! How do I properly forward this issue to Microsoft etc so they can have a look at it? Would have loved trying to updating to it to see if this would then fail the system again or if it's just the clean install to it that has this problem. So many hours spent troubleshooting this issue and trying different settings. I have been so sure this was a motherboard / BIOS problem that I didn't really think that it could be a Windows problem. I put in the RAID card after everything was running and VOILA it works like a charm. I then formated and reinstalled using this build. So I went online and found the ISO closest to this which was 1903 (build 18362.300). I looked to see which version that computer was running and it was the 1903 (build 18362.900). Like I wrote in the orginal post, my RAID-card worked immediately in my other computer which was running Windows 10 Pro as well. I am pulling my head out and would appreciate any help! Oh and firmware for the Megaraid and BIOS for motherboard are upgraded to latest. I thought maybe it's just a missing driver but I can't even get to a point of installing driver. For Windows, I can't even get it to boot from USB bootable or get into safe mode. From UEFI bios I tried mostly everything and anything in regards to fast boost, CSM settings (UEFI/legacy) etc. I am not sure if it's windows or the motherboard that's not complying with the LSI raid card. It then continues and attempts to start windows however it gets bsod before the login page with stop code: DRIVER IRQL NOT LESS OR EQUAL. The Megaraid webbios posts like it should, I can see all drives listed and the virtual drive that I have had for ages and then the UEFI bios for the motherboard. So last step was just to add the raid card in the PCI-e and everything should be fine. Installed and got it to run just with the m.2 nvme SSD on the motherboard. So I built my new system getting a Z490-i from ASUS. First I tried just moving the LSI Megaraid 9271-8i card to another computer to ensure it would work and that system running ASUS z87 pro motherboard and windows 10 Pro picked up the array immediately and everything was as it should. So my old server gave up on me so I decided to build another computer using Windows 10 Pro instead.
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