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Take it back to a Sony Xperia Care center
http://www.sonymobile.com/global-en/support/contact-us/
did you bought this phone at an official Sony retailer?
I'm sorry to hear that, you will have to send it back to your uncle so he can take it to a Sony Xperia Care center
You could try with PCC but I doubt it
Update Service (SUS)
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355