M.2 SSD disappeared when disabling secure boot

Hi, good people. I have a HP prodesk 600 miniPC with Intel i5 6005, 16 GB RAM and an M.2 SSD harddrive… BIOS is updated to latest version.

In order to install ROCK I have disabled secure boot in BIOS, but my ssd has disappeared all together. When I enable legacy-mode the ssd comes back, but still ROCK won’t install on it. It comes with an error “no harddisk available”.

Is my hardware incompatible? Or do this maybe have to do with Master Boot Record (MBR)? I would really like to install Roon OS on this hardware, but so far I’m not able to.

Thanks.

You need secure boot disabled. Boot from a USB Rock installer thumb drive. Follow the on screen instructions, and select the M2 drive to install to.