Upgrade or Install Sony XPERIA Z2 D6503 to Android Lollipop 5.1.1. The firmware 23.4.A.1.232 available for downloading https://drive.google.com/file/d/0B1AAC4lt7nzON2s4dGJ5eWNyOWM/view?usp=sharing. You can download your Sony XPERIA Z2 D6503 firmware 23.4.A.1.232 at the page. How to Upgrade Sony XPERIA Z2 D6503 to Lollipop using Sony Xperia Flashtools: