Sony is delivering on its promise dating back to October last year to bring Android Marshmallow to the Xperia Z2, Xperia Z3 and Xperia Z3 Compact. After a Beta build was released a month ago, users of the smartphones are starting to receive the official update. The firmware, carrying a build number 23.5.A.0.570, brings the OS version to the latest 6.0.1, and includes the February Android security patch as well as the latest camera app interface. Now, there are the usual caveats, though. For one, only three models are getting the update for now, specifically the D6503 Z2, the...
Source: http://www.gsmarena.com/sony_xperia_z2_z3_and_z3_compact_are_getting_official_marshmallow-news-17691.php