Xperia M2 Aqua gets Android 4.4.4 update (18.3.1.C.0.21)

The Android 4.4.4 KitKat update with firmware build 18.3.1.C.0.21 recently started to roll for the Xperia M2. Now the same build number has been released for the Xperia M2 Aqua (D2403 and D2406). Th…