I have a 786NA, and fortec did release an update for transponders.'
Since it doesn't have a blind scan function, you have to either rely on the pre-programmed settings, or add new ones yourself.
Or update the factory programming with updated trasponder lists.
Go over to
http://www.fortecstar.com/downloads/
and look at whats available for your model.
Note the warning on the main page about the 786 model!