I got this old phone from 2012, Sony Xperia Acro S LT26W. Unluckily, Sony doesn't support my phone now. So I want to upgrade it my own. The phone's version is 4.1.2 Jellybean. I want it to be Kitkat or maybe Lollipop. Haven't tried upgrading, so I need some tut of u guys. My phone is rooted by the way. Thanks