Android 6.0.1 Marshmallow 23.5.A.1.291 firmware update is rolling for Sony Xperia Z3 now, same update has earlier been confirmed rolling on Xperia Z2 also. It is also expected to hit Xperia Z3 Compact very soon.
23.5.A.1.291 firmware is confirmed in regions like France, Italy, Turkey, MEA, Austraia on Xperia Z3 D6603. Update is available via PC Companion for the time being.
Xperia Z3 23.5.A.1.291 firmware update
23.5.A.1.291 firmware brings security patch, dated 1 May 2016. STAMINA mode and ULTRA STAMINA Mode is back now.
Xperia Z3 23.5.A.1.291 firmware ftf
For Xperia Z3 D6603
Flash the ftf on your device (no root, no unlocking of bootloader required, Tutorial here).
If you have already updated your device, let us know your views on it. Drop your comments below.