We always talk about it here, the beauty of Android is that developers are free to play around with it and see what they get. Today, the “what they get part” is an Android Marshmallow custom ROM – the latest and greatest version of Android – now tweaked to work on the older models of the Xperia line, particularly the ones from 2011. Most of these models topped out at official builds of Android (4.1) Jelly Bean and Android 4.0.4 Ice Cream Sandwich, you would never think they’d still have a taste of Android 6.0.
We’re going back to times when Sony still played tag team with Ericsson (hence, Sony Ericsson) and the models included in this experiment are the Xperia Arc/Arc S, Live with Walkman, Xperia Neo V, Xperia Neo, Xperia Pro, Xperia Mini Pro, Xperia Neo L, Xperia Active, Xperia Mini, Xperia Ray, and the Xperia Play. XDA developer “mikeioannina” has put out an unofficial ROM based on CM13, which as we know is the CyanogenMod ROM based on Marshmallow.
There are requirements if you want to bring your old Xperia model back to life, or at least give it a run at Marshmallow. First, a particular build based on ICS is needed – your phone must have the ICS 4.1.B.0.587 build on it before you start, and it is required that you have a fast SD card (class 10 or higher) to work with, and empty is good.
The complete instructions are over at the official XDA thread, so click on over at the source link below. Remember, always back up data that you need before going through anything like this. Who knows, that old phone might contain stuff that you forgot you had.