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Performing a system repair using PC Companion - This will factory reset your phone and erase all data so best to backup before you begin
Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process
If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP
If you are using Mac, you can also perform a software repair via Bridge for Mac.
Wait to connect your phone to your Mac > Open Bridge for Mac > Select "Xperia > Repair Xperia Device". A step-by-step guide will now appear and this guide will also tell you when and how to connect your phone.