open your app then settings

player

live change to exo and  select ok

OR BY HOLDING IN THE SELECT BUTTON AND PLAY BUTTON TOGETHER 

FOR 10 SECONDS ON THE FIRESTICK REMOTE UNTIL THE STICK REBOOTS

NO VOLUME ON APP?

IF OUR SYSTEM STATUS SAYS ONLINE AND YOU HAVE AN ISSUE

PLEASE TELL US IN DETAIL THE ERROR MESSAGE AND WHAT UVE TRIED TO SOLVE