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Download sony update service:
http://www.sonymobile.com/gb/tools/update-service/
Install it,open and follow the steps provided.
Usually,do you restart your phone or not?
Did you try a software repair?
Download sony update service:
http://www.sonymobile.com/gb/tools/update-service/
Install it,open and follow the steps provided.
Yes,you need a laptop or a PC.It should help you.