I have an MBox ( Formerly Gostreamer T8X-S), this is running S905 Quad Core. Android 5.1.1.This device has been working fine for a couple of years, all of a sudden NO Sound. I have tried all the various fixes, but nothing happens to change the situation. I cannot update the firmware using OTA, this has been disabled by Gostreamer ceasing to trade. The Android menu does say that there is an upgrade pending. Any advice on what I can do. I don't use Kodi, but have the IPlayer, All4, My5, running direct plus USB files for Movies.