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the tre keys in the buttom of buttons not working
@RS59
I'm sorry to hear that, could you test your device with
settings > about phone > diagnostics > test > test touchscreen
also you could repair the phone with PCC to narrow down the issue.
software repair
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
If you don't have the diagnostics app preinstalled
https://play.google.com/store/apps/details?id=com.sonymobile.androidapp.functiontester&hl=en
