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Try to contact a staff member:
http://talk.sonymobile.com/t5/Welcome/Community-users/m-p/634967
Try
settings > apps > all > camera > clear data
also look for background defocus > uninstall > restart your phone and redownload it from the playstore
Did you check for it on google play?
Go to settings-apps-all-background defocus,force stop and clear data.Access it again.
Background defocus,look for it on google play.
I got it for Z1.