Both tnx for your answers, this is the catch:
At this moment i run a custom build version of TVheadend, indeed for using it with HDhomerun.
The version i run atm is "4.1-2449~gda58349 (2017-03-04)", so its a little outdated.
As far as i understand i need to make a new custom build to update the TVheadend version, this is not a real problem, but can i keep al the settings as channels, muxes etc.
Because if i build a new build i need to config it al again and this takes a long time....
Or can i download the latest source and build it over the old source with
cd tvheadend
./configure
sudo make
sudo make install
an keep the settings?
Hope you can help me