The firmware updates are rolled out in stages. Some custoemrs received the latest update around 4 weeks ago, I received my update to 4.39 last week.
The 4.39 update has the following changes which may be useful to you
Settings > Audio & Video > Audio output has been updated and now has the following three options:-
PCM 5.1 (HDMI only)
Choose whether you want the audio output to follow the quality of the original content (Dolby Digital where available) or to be converted to PCM 2.0 (stereo) or PCM 5.1 (uncompressed multi channel sound). Using PCM settings may resolve audio sync issues. Netflix will always follow content.
Check under Settings > Info > About > to see which build version you are on.
If your box hasn't yet updated it's worth rebooting it as it may have downloaded and be waiting to install
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