How to change android os?

I want to change my tablet and phone's operating system from Ice Cream Sandwich to Jelly Bean. What is the easiest way of doing so?

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Asked Apr 11, 2013
Yes there is one option available if you wan to change your Android OS. Ubuntu is available for Android phones. Ubuntu for Android enables high-end Android handsets to run Ubuntu, which is the world’s favorite free PC desktop operating system.
Its benefits are
1. It is integrate easily with Android phones, which are already in development.
2. Drive adoption of 4G handsets, as online apps like Google Docs shine with low-latency connections.
3. Ubuntu is the killer app for multi-core phones
Answered May 21, 2014

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