Phone keeps restarting after latest update

[mipieb]

 After starting the updating setup via Sony PC Companion this program told that at time my PC is preparing (and it will take some time) itself for updating I can disconnect my phone or not, so I disconnected it and then I pluged it in again. Phone started to update (it turned off and started updating) and suddenly communique came out telling me that my phone is no longer connected. Sony PC Companion told me to unplug it and restart, after that my phone keeps restarting all the time. 
HELP ME GUYS !

[Thommo · Accepted solution]

Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data

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

[mipieb]

Thank You very much, that worked perfectly !

[Thommo]

Glad it worked

[acsber]

i still have same problem i do all the instrction you said by not working it keep restarting