Adobe, who authors the Flash Player has been ending Flash for years. They no longer update it for TVs so you can't be sure about Flash on TVs or about anything today.
It's a common question but little or nothing to do with Samsung or the Filmon folk. If it plays on say a PC, try a HDMI cable to the TV.
Hi, recently bought the 48" JS8500 and I can't play Filon Live TV as it doesn't play Flash Player.
Is there anything I can do about this?