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After updating to your latest kitkat,i'm facing camera problem.My front camera is working well,but whent i tried to use rear camera it freezes,then i have to lock and unlock the phone.And for fewe days i could not take pictures.So please tell me solution.
Try this
settings > apps > all > camera > clear data > restart your phone > check your phone.
You could also reinstall the latest update with PCC. Are you saving your pictures on the internal storage or an SD card?
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Performing a software repair using PC Companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 60% battery.
Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).
Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).