Sony has started rolling out the Android 5.1 Lollipop update to both Xperia M5 and M5 Dual smartphones. The update also includes Android security patch for the month of January. Weighing in at around 600MB, the new update bumps the M5's build number to 30.1.A.1.33, and that of the dual-sim variant to 30.1.B.1.33. It brings along the ability to take pictures from the camera using the SmartWatch 3, as well as improvements related to volume and silent mode control. For those who aren't already aware, the M5 will land in Europe in February - it's currently up for pre-order in the UK, with shipments beginning February...
Source: http://www.gsmarena.com/sony_xperia_m5_and_m5_dual_getting_android_51_update-news-16356.php
