Xperia Z3 was the flagship device of second half of 2014. Xperia Z3 runs on a 2.5Ghz quad-core Qualcomm Snapdragon 801 processor, 3GB of RAM, 16GB internal storage and a 3100mAh battery. The 5.2″ IPS LCD display has a 1080p resolution and utilises Sony’s Triluminuous backlighting technology. The Xperia Z3 is also IP65 and IP68 compliant, meaning it’s good for those dusty or wet environments. Z3 also has a new impressive camera, featuring a 20.7MP.
Sony announced Marshmallow for Xperia Z3 almost 3 months ago. Yet there is no word from Sony on the exact date of the rollout. According to sources, it is still in testing phase and it might take a few more weeks. If you are tired of waiting for the official update, you can try crDroid custom ROM. It will update Xperia Z3 to Android 6.0 Marshmallow. A detailed guide on how to install this ROM is given below.