How to upgrade to android 4?

How do you know when the update is available and can the guarantee No my phone?

And also, please let me know the step by step method improvement.

Once the software is out, daily connect your device to your pc companion to search for the update, as appropriate, will inform you of the same and then just follow the steps

No, the warranty will remain, and not cancel.
There is no action, but just connect to pc companion and follow what it shows, simple

PC Companion http://www.sonymobile.com/global-en/tools/pc-companion/

Tags: Sony Software

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