Hard Reset SONY Xperia TL LT30at

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. Power off your device.
   
2. Next hold and press Volume Down + Power button until you see menu on your screen.
   
3. In this menu you can choose from this options: Fastbook, Recovery, Clear Storage, Simlock.
4. Select Clear Storage, and confirm with Power button.
   
5. Now press Volume Up to confirm operation.
   
6. Good job!

Third 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!

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