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Boot on safe mode
if not, then repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
if not then contact your Local support to get it inspected again
Go to Settings -> About phone -> Diagnostics -> Test -> perform a "Camera button" test
Dear Quester,
the same for your advice. I tried it and as nothing happened it gave a report that the test was failed.
Thks
Hi ordepcosta
Welcome to the community
Here's how to run the repair on PC Companion:
And Bridge for Mac:
6 . Select your model of phone from the list that appears
You will want to start these processes with the phone powered off and disconnected from the PC.