Tvheadend

Hello all,

I try this since I cannot really admit that there is no way to make anymore work an USB DVB stick.
I have two of these USB sticks (Elegato DVB-T2 and August EyeTV). They are seen and recognized by my Synology DS620slim NAS.(DSM 6.2)
None of them appears in the TVHeadEnd Adapter tab. (The list is empty).
I read that TV usb sticks weren't anymore supported.
I'm not experienced with linux commands but I tried to list the drivers. Only the file "backports_dvb" is linked my subject in the '/dev/dri/ folder.

Is there a way to install the driver somewhere and make the stick appear?
Thank you in advance for your help.
Joaquim