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I have a problem with the keypad buttons (home back menu) these three buttons dont work. i have updated the software but they still dont work. Anyone can tell me where is the problem?
They could be physically defective. Go to a service and let them check it.
Or try going in the service menu and run the test for keyboard . code is *#*#7378423#*#*
It might be a hardware related issue in that case so it's wise to let one of our service shops take a look at it. For info of how to easiest proceed please contact your local Sony Mobile support. You can find contact info on the link below. 
http://www.sonymobile.com/gb/support/contact-us/
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