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Does your phone has a protective case or film that might be blocking or partially blocking the front facing camera?
If PCC doesn't solve this issue, then you will have to send it back to your Local support
Bridge (for Mac)
Alternatives on How to backup Xperias
Is your back camera fine? . My back camera recently developed an issue. I tried to revert back to kitkat 4.4.4 from 5.1.1 lollipop, which resulted in bootloop. THen using PC Companion I restored to 5.1.1 . After that I can see some random lines appearing on my main camera pics especially on indoors where there is a bright area of light light a bright sunlit window etc.
I can see some lines in the picture in the area of bright light source. It happens only in HDR.