How to keep config when downgrade to Stable?
How to downgrade from 4.3 unstable to 4.2 stable with config kept?
To upgrade to unstable it is just to backup usr/home/hts/.hts/tvheadend in 4.2 and restore it in 4.3. This will not work when downgrade.
Okey, here is what worked for me.
Backup the entire tvheadend folder under the hidden .hts user in the home directory.
Now, downgrade to stable using apt or similar, after changing to repository for stable releases.
Then stop the Tvheadend service and copy back all the subfolders from the backup you made, eccept for the CA-folder since there is support for new CAMs in 4.3 that makes the stable build to not start.
Finally, start tvheadend service and configure the CA-section.