Out of interest, I have run builds and installed updated feeds for following GBUE4K, Zgemma Combo and Octagon SF8008.
Command dvbnet -l gives following results:
GBUE4K: Found 0 interfaces (s).
Zgemma Combo: Error: couldn't open device 0: 2 No such file or directory
Octagon SF8008: Found 0 interface(s) .