Sony Mobile h confirmed via his Twitter account his plans to update the Sony Xperia M4 Aqua. According to the company, the Xperia M4 Aqua will miss the update to Android 5.1 Lollipop and will receive an update to a newer Android 6.0 Marshmallow.
Note that while users are waiting for Android 6.0 Marshmallow, Sony Mobile has released an update to Android 5.0 Lollipop for the Xperia M4 Aqua (model number E2303) and M4 Aqua Dual (model number E2333) but only in the Nordic countries.
We will remind, affordable smartphone Sony Xperia M4 Aqua is protected against the ingress of water and dust, was presented to Sony Mobile at the March exhibition MWC last year.