1. Power on the phone.
2. Then goto Settings -> Backup & reset -> Factory Data Reset -> Reset Phone.
3.Now select option "Erase everything", and confirm that.
1. First you should download flashtool from Sony website: http://developer.sonymobile.com/services/flash-tool/
2. Make sure, that you have installed drivers for your USB data cable.
3. Now turn off your device.
4.Then press and hold Volume Down, and connect to USB cable.
Next follow the instructions in your screen, and accept appropriate options.
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