Sony Xperia C4 has just received an update, but unfortunately it is not what we expected. We saw the phone on the list of devices, which will get the Android 6.0 Marshmallow upgrade.
Odly, we can download the Android 5.1 Lollipop instead, the version this model wasn't supposed to get in the first place.
Whenever you like it or not, in the couple of days your build number will change to 27.2.A.0.155 if you have the C4, or 27.2.B.0.155 for the C4 Dual.