FCC drops rule requiring cable companies to provide CableCARD
If using Channels DVR you can get a m3u by all or specific device
Gives you m3u with all devices ...
http://iptochannelsdvr:8089/devices/Any/channels.m3u
Specific tuner
http://iptochannelsdvr:8089/devices/13147C7B/channels.m3u