cannot unlock xperia j st26i

[ubais]

my phone is locked by too many wrong pattern attempts. and now asked me to enter security answer unfortunately i forgot my security answer....now i m trying to resolve this problem by updating software via pc companion but the computer showed the message that s1 boot driver not installed.....so what should i do????

[Thommo]

Try performing a system repair as this will often fix issues - This will factory reset your phone

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 onscreen 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