# Stop tvh, backup your current config (just copy the whole config dir).
# Pick an old backed up config (in the backup folder of the config dir) and restore it.
# Downgrade using apt..
sudo apt-get install tvheadend*=<config version>
Use
sudo apt-cache show tvheadend
for available versions - use the version string from this).
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I'm running 936 here & can record via the webui but not Kodi, will open an issue for this..