on live tv you're getting "no signal found"?.......I still can't play live TV, movies and series on FireTV ......
and movies&series display a "play back error!" popup?
in ibo settings, select external players, choose vlc player then ok to save, and try to play movies or series..... what happens? ....... if movies/series play via external player it sounds like it may just be your specific service(s) not playing ball with firestick+ibo combo, maybe try different providers to check(http n https)?
ps, if you wish you can pm.... happy to do lil checks n test with you