Shortly: inserted a new card, made a search, 650 channels on list (it is crazy), of course I had to add new transponders because no predefined in TV, +100 more channels.
I am contacted the local Samsung support in Slovakia regarding transponder issues. "why I can´t delete transponders from TV, why I can only add?" The answer was that you can delete the not needed channels by external program. So, it is true, but how I do know, which one is the working (5 Eurosport, 10 nickelodeon, 7 NAt geo, etc) channel? Answer was I can´t help you.
My 15y old external no-name receiver was able to do it.
The guy from support promised to send the issue to technicians. You can think what happen.