Sony Mobile has started to roll out the Android 6.0 Marshmallow update for the Xperia C4 with firmware number 27.3.A.0.122 and the Xperia C4 Dual with firmware number 27.3.B.0.122. At the time of writing the variants that are seeing the Marshmallow update include the Xperia C4 (E5303, E5306) and the Xperia C4 Dual (E5333, E5343). However, the remaining two variants (E5353, E5363) should go live shortly.
We will provide firmware links for each release as per usual in due course, but in the meantime, let us know your early impressions of the release. There is no sign of the same update hitting the Xperia C5 Ultra just yet, but we’ll keep you posted as soon as it is released.