Hard Reset SONY Xperia Tablet Z LTE

First method:

1. Check that if your tablet is on.
   
2. From the Home screen tap Apps -> Settings -> Backup and Reset -> Factory reset -> Reset tablet.
3. Select option option "Erase everything", and confirm that.
4. Finito!

Second 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.