XG firewall 18 [SW-18.0.1_MR-1-Build396-396] will not install on B450m motherboard

I get "reboot and select proper boot device or insert boot media in selected boot device"

I got this the last time I tried to install on this motherboard too, and the solution was to install on an intel motherboard based machine and swap the hard disk after install. That machine is not available.

What is the fix for this? Thanks in advance.