Hi. Thanks for using fixya. This problem can be solved by reloading the software with flashtool or sony companion. There is no hard reset for Sony like other androids.
select your firmware here. and also Flashtool
http://forum.xda-developers.com/showthread.php?t=2311964
If you want straight forward with step by step, download the Pc companion:
http://www.sonymobile.com/gb/tools/pc-companion/
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