As expected, it didn’t take long for the new 5.0.4 software update to begin rolling out to devices. This update appears to only be for devices already running Fire OS 5, which are the 2nd-gen Fire TV and Fire TV Stick with Voice Remote. First generation Fire TVs and Fire TV Sticks that are bundled with non-voice remotes will most likely be receiving an update to Fire OS 5 in January. This update looks to be just bug fixes that include Dolby Digital audio fixes.
At least one reddit comment indicates that this update has finally added a new Dolby Digital option to the Fire TVs audio settings. The new Fire TV has always had a Dolby Digital Plus option, but those with older audio equipment that doesn’t support the “Plus” standard have thus far been unable to get surround sound audio out of the Fire TV. I haven’t received the update myself, so if you have and can verify that Dolby Digital audio works, please be sure to leave a comment below.
Like all Fire TV software updates, this one is rolling out slowly to a few devices at a time. You can force an update check from the Fire TV’s settings menu, but if it’s not your device’s turn to update, there is no way to manually install the update. If you’re wanting to root your 2nd-gen Fire TV, you better be sure your device is updated to software version 126.96.36.199 immediatly, since the current rooting method is only compatible with that version. Once the 5.0.4 software update becomes available for your Fire TV, you will no longer be able to install older versions.