It is 6.0.1 Marshmallow build firmware with 23.5.A.0.570 build number. Sony is releasing this update via OTA (over the air) but if you didn’t receive it yet don’t worry you can still have it. You can manually update Sony Xperia Z3 D6603 to Android marshmallow 23.5.A.0.570, all you need to do is follow our guide.


Create a backup of all your important data like your Apps backup , contacts, Text data and other multimedia files. Enable USB debugging, go to settings > developers options > enable USB debugging. If you don’t see developers options in settings enable it in About Phone option by tapping build number for seven times. Before proceeding forward make sure you have installed Sony flashtool. Make sure your device is fully charged or at least has more than 70% charging to avoid power shortage problems. Install Sony usb drivers on your PC.


This process is only intended for Sony Xperia Z3 model no D6603, Do Not try it on any other Z3 variables or you will end up bricking your device. Check your device model number in settings under about phone option. Incase something wrong happens with your phone during or after the process then won’t be responsible. Do this at your own risk only. After the process your phone will be updated to official Marshmallow OS.

Download These file

Download: Marshmallow 23.5.A.0.570 FTF Z3 D6603. Download: Sony Flash Tool Download: Sony USB Drivers

Update Sony Xperia Z3 D6603 to 6.0.1 Marshmallow Official, Steps

Congrats! You have successfully flashed official Marshmallow firmware on you Xperia Z3 D6603. Hope you liked our tutorial to Update Sony Xperia Z3 D6603 to Marshmallow Stock OS. If you are facing any problems regarding installation comment below, we will try to help. Please share it and subscribe. Sharing buttons are below and subscribe box is at the end.