Hard Reset SONY Xperia P LT22

First method:

1. Check that if your phone is on.
   
2. Browse to Settings -> Backup & reset -> Factory Data Reset -> Reset Phone.
3. Select option option "Erase everything", and confirm that.
4. Finito!

Second method:

1. First download flashtool from Sony website:http://developer.sonymobile.com/services/flash-tool/
2. Make sure, that you have installed drivers for your USB data cable.
3. Switch off your cell phone.
   
4. Hold and press Volume Down, and connect to USB cable.
   
5. Please follow the instructions in your screen, and accept appropriate options.
6. Good job!

Third method:

1. Power off your device.
   
2. Next hold and press Power button + Volume Up for about few seconds, or until you see menu of your screen.
   
3. Afterwards follow the instructions on your screen.

Fourth method:

1. Back up your important files, and download PC Companion from here:http://www.sonymobile.com/gb/tools/pc-companion/
2. After installation you will see window with 4 options.
   
3. Now hover your mouse over the option "Support Zone Now!" and click "Start".
   
4. Next plese wait, until your program Install a suitable additive.
5. Afterwards from the window with 3 options choose "Phone / Tablet Software Update", and click "Start".
   
6. Then click to "repair my phone / tablet".
   
7. Accept all informations.
   
   
8. Now your program will run "preparing computer for software update".
   
9. Select your model.
   
10. After that you will see window with informations.
    
11. Follow the instructions, and connect your device into your Personal Computer.
12. Success!

Fifth method:

1. Switch off your cell phone.
   
2. Next press and hold Power button until you see logo Sony.
3. Now please quickly press and let go Volume Down until you see menu of Recovery Mode.
4. From this menu choose option "wipe data / factory reset" using Volume buttons to scroll, and Power button to confirm.
5. After that select option "Yes -- delete all user data".
6. Then accept "reboot system now".
7. Done!

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.