sorry to hear that.

perhaps the tv and android version is too old?

becos afaik, all current devices using google androidtv will work.

did u install the 2 other apps - indic keyboard and orientation from playstore?
former is required; if not, it will get stuck.
latter is required to change from portrait to landscape.

btw, what apps could u sideload to work? can do hypptv everywhere?

i am a bit surprised if u cannot get astrogo just like another sony 800c user.
androidtv should work, like sharp's ue630x range, and boxes like nvidia shield and mibox that use androidtv.
the explanation may be android 5.1 or higher is required.
anyway, this astrogo app is picky - won't run on just any tv or box.