Sony mobile has rolled out another small fimware update to their latest flagship of Xperia Z series, Xperia Z3+ (E6553) from the build number 28.0.A.7.31. So this moves from the previous build number 28.0.A.7.27 to the new 28.0.A.7.31. So far update is only available in Taiwan if you are on PC companion. But update is live in some regions via OTA. If you've updated it please kindly let us know about the changes.