Setting DVR up for XMLT

Hi there, I am trying to set XMLTV as an EPG source with no luck so far.

I upgraded my Linux based DVR installation to version: 2020.10.19.2252
I am connected to HDHOMERUN custom device which is recognized by DVR
and shows device's TV channels being recognized and mapped properly:

however when I attempt to pick XMLTV as a EPG source the option is not there,
I can only see default countries as provided by Gracenote only.

Any pointers will be appreciated.

What is NETTV?

Proxy emulating HDHomerun http api so my tv channels could be exposed to Channels DVR.

I am returning this to register proxy as a hdhomerun device and my tv channels show up in
the clients and work without issues:
{"FriendlyName":"NETTV1.1","Manufacturer":"","ModelNumber":"HDHR-NETTV1.1","FirmwareName":"","TunerCount":1,"FirmwareVersion":"","DeviceID":"NETTV1.1","DeviceAuth":"","BaseURL":"http://+ settings.ip +:+ settings.port +","LineupURL":"http://+ settings.ip +:+ settings.port +/lineup.json"}`

I just need to know what to change to have xmltv shows up as an option as of now per earlier post that option is not there.

You can try:

curl -XDELETE http://x:8089/dvr/lineups/NETTV1.1

That works, thank you!