Theres no need for mods, the bios version has the AMI NVMe DXE driver to support NVMe, now that adapter may have been a bad choice as it only supports 1 NVMe disk, will not see any others, due to motherboard and the adapter cant support bifurcation pcie lane slot.
Step 4 of the guide
[HowTo] Get full NVMe Support for all Systems with an AMI UEFI BIOS - Special Topics / NVMe Support for old Systems - Win-Raid Forum (level1techs.com)