That model seems indeed to be no longer supported.
From what I’ve been reading, this particular case is not related to your client version not supporting a certain server version but the old communication encryption of those old models no longer being supported in general.
Workaround might be the addition of an entry-level streaming box (e.g. Roku, FireTV or Chromecast sticks)… unless you want to go for a more powerful Roku, Nvidia Shield or Apple TV
