Sony has already deployed the latest Android 6.0.1 Marshmallow firmware for many of its devices like the Xperia Z3, Xperia Z2, Xperia, Z5, the Z4, and for some of the Z series tablets as well. However, this time, the Japanese manufacturer has released yet another update to its brand new Sony firmware. This will take the firmware to a new build number 23.5.A.0.575. Even though this is just an incremental update, it brings critical bug fixes like WiFi improvements, etc. Here we have the full firmware files for the same.