We have already reported that the Original HTC Desire 816 received its official Android 5.0.2 Lollipop update. Now, it's the turn for the Dual-SIM variant of HTC Desire 816G to get the same Android 5.0.2 Lollipop update.
According to the latest reports we got from our HTC Official Updates Tracker, The Desire 816G is expected to get the Lollipop update is currently under "Testing" and should start Rolling-out during the last Quarter of the year (Q4,2015).
The HTC Desire 816H update will pack many performance improvements, new lock screen, new notification panel and updated User Interface but still keeps the Sense UI v6.0 on the Android 5.0.2 Lollipop build. You can check the official update change-log on the screenshot below (taken from an HTC Desire 816 original variant).
Plans for Updating this variant to Android 5.1 Lollipop or Marshmallow 6.0 is still not clear yet, stay tuned!
Source [HTC Updates]