Phone after restart asking for unlock pattern which I have not set and no other option is given

Hi all, my Z3 Compact phone was heating up a lot in the recent summer days. At some point it was not reacting and not booting. So I pressed the yellow OFF button next to the nano card SIM holder.http://support.sonymobile.com/gb/xperiaz3compact/userguide/Resetting-your-device/ After this, the phone restarted and it is asking me for an unlock pattern, which I had never set before.It is not offering me any other option like Google identification or security question. And after 5 wrong attempts it tells me to wait 30 sec. I can see that the phone is working, I receive calls and can see that messages arrive. But I can't unlock the phone!! I tried a hard reset using PC companion but it complains and says that I need to have the screen unlocked to continue! So also no solution there! Any help would be greatly appreciated.

Hi
Try this and see if it helps > http://talk.sonymobile.com/t5/FAQ/How-to-unlock-a-phone-w-o-reseting-reformating-the-phone/td-p/927295
Also, regarding repair with PC Companion, follow steps this way
Update / Repair your phone via PC Companion
Download PC Companion and install it. Do not connect your phone until you're asked to do so.
Launch PC Companion > Start Support zone > Start Phone/ Tablet Software update > select Repair my Phone / Tablet > Follow the on-screen instructions it shows. 

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