My tablet galaxy 3 has android 4.4.2. Should i upgrade to 5.1, and how?.
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Android Lollipop wasn't the best OS when it launched any some had issues with performance. So I would say, if you are happy with 4.4.2 then stick with it.
However, if you would like a change of scenery and want to upgrade, simply go in your settings by swiping down from the top of your screen, then find a tab relating to Software update or Software version. There should be an update button somewhere around there
One of our writers made a nice long post a little while ago detailing all the various things Android Lollipo brings to the table, its quite a long read if you are up for it haha
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Lollipop Review
Here are the improvements made to Android 5.1 from 5.0
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Android 5.1 Improvements