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I would like to explain to my friend who lives in another country how to upgrade their phone to Android 2.1 so that they can use WhatsApp.

How can they do this?

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See also: How do I update the OS on my device? – Al E. Oct 23 '12 at 14:45

Try pointing them to this link on the Sony Mobile website:

It has some software to download for mac or PC which will allow your friend to upgrade their device.

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