just for sanity check, could you disable vdr (backend, vdr.vnsi ...) and install Tvheadend 4.2 and after that have a look if the adaptor appear in the webui ? (your-box-ip:9981)
and pls a full dmesg | paste
After install vdr (services and tv clients) and restart play2 ecerything stop and freeze on bootscreen .
this could only happen if the dvb driver crash (i think) - I have no WP2 so no experience