Firedtv DVB-C Scan for available channels

[Michel]

I have a Firedtv DVB-C receiver and noticed that the automatic scan for
available channels doesn't pickup all available channels correctly.

I've manually added all frequencies for my provider to the
PredefinedScanCable file but SageTV crashes on one frequency and misses
a number of channels that are picked up by MediaPortal for example. Now
I want to add the channels that were missed by the automatic scan manually
and (if possible) add the channels that are located on the frequency that
crashes sageTV.

I have all information available for the missing channels (frequency, name,
symbol rate etc.) but have no clue on how to add them to SageTV. I tried
using Add channel to linup but cannot get it to work correctly. I tried adding
them manually to the FireDTV DBA Receiver.frq file but that didn't work
either.

Any ideas?