Sony Xperia P hard reset
Xperia P reset via MENU
Your device freezes or has fatal errors
Press and hold volume up key+ power button together until phone restart.
If this does not solve the problem, perform a factory data reset. In Idle mode, open the application list and select Settings → Privacy → Factory data reset → Reset phone → Erase everything.
Clear storage : Erase the credential contents from the device and reset the password
Set an unlock pattern
Once you set a screen lock, your device will require an unlock code each time you turn it on or unlock the touch screen
Settings → Location and security → Set screen lock → Pattern
If you forget your PIN or password, bring your • device to a Sony Service Centre to reset it.
Set an unlock PIN code
Settings → Location and security → Set screen lock → PIN
Set an unlock password Sony Xperia P,
Settings → Location and security → Set screen lock → Password.
firmware update with PC companion softwareDownload PC companion and install
Install PC companion on your PC computer. Follow instruction. For firmware update you need a micro USB cable. When the pc recognizing your XPERIA P it will install the necessary driver files.
After your XPERIA P connected press Start / in Support Zone
You can also use Sony update service tool
PC Suite is out of date use PC companion software instead