Upgrade or Install Sony XPERIA M4 Aqua E2303 to Android Lollipop 5.0. The firmware 26.1.A.2.167 available for downloading https://drive.google.com/file/d/0B1AAC4lt7nzOVktVZDc0QnkyZHc/view?usp=sharing. You can download your Sony XPERIA M4 Aqua E2303 firmware 26.1.A.2.167 at the page. How to Upgrade Sony XPERIA M4 Aqua E2303 to Lollipop using Sony Xperia Flashtools: