How to enable NPU on Rock 3c?

I use the latest B42 build of Debian bullseye xfce from github here

ls /dev/dri/only shows by-path card0 renderD128 and no renderD129

I want to use Figrate, I have successfully use the MPP hardware transcoding for videos but apparenetly the NPU drivers / kernel modules are not installed.

My board is Radxa Rock 3c blue version v1.4 (or 1.1 - the printing on the PCB was too blurred).