Hello Norrik120,   Did you use the LifeCycle Controller > OS Deployment to install the OS?  May give that a try. It will supply drivers depending on the OS you select to install.   The AX-750 driver page only shows one driver, a video driver. [URL]   Please let me know how OS Deploy works for you.   Are you able to contact Support directly in your region to have an engineer work with you on this?
Hello,I have a problem with my AX-750 servers.The servers were installed for testing with Windows 2019 core.Now the tests are done and I have reinstalled the Windows today and it only shows me the 4 x NvMe hard drives on the Boss controller.But the 16x SSD's on the HBA controller are missing.In Idrac as well as in Bios the SSD's are shown but in Windows they are completely missing.In Powershell get-physicaldisk they don't show up either.Does anyone have an idea why the hard drives don't show up?  
Ax-750 physical disks missing