thank you for updating!
i got an error with my usb-tv-receiver after dmesg | grep dvb: [14.137183@0] dvb_usb_2 Unknown symbol dvb_create_media_graph (err 0)
but maybe the problem is sitting in front of the computer
i have tried it again with kszaq's build. it finds the usb-receiver and can load it, but the vdr-pvr-backend plugin doesn't work neither in this build, in your build AND nor in the original build for the raspberry 3b ....
next thing on kszag's build is that it loads the wrong firmware of my usb-receiver. could you think about it when you creat a new update. i don't know if i have to change something or it has to been done by the developer .... thank you