Sony has released a software update for its Xperia Z5 range of smartphones and the update is available for the Z5, the Z5 Dual, Z5 Compact and the Z5 Premium.
The update brings the above handsets to Android 6.0.1 Marshmallow and it comes with the firmware number 32.2.A.0.224
The update brings the Stamina Mode, which is a battery saving mode for the device back to all of the Xperia X5 handsets.
The Android 6.0.1 software update for the Z5 range also includes the April security update for Android from Google. The updates have been released an an over the air update and you can check if they are available from the settings menu.
Source Xperia Blog