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I'm trying to change my language input into japanese keyboard but nothing in this model! To think SONY is popular in japan!
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That sounds strange. You should have a Japanese and Chinese keyboard preinstalled. What options do you have under Settings -> Language & input?
Not just people that live in china will use the chinese keyboard and the same goes for the japanese keyboard, there are people that use such keyboards in the US, Europe, pretty much all over the world there might be someone who will use such keyboards.
As for lollipop 5.0 read this:
and as for Android 5.1 read this: