Hard Reset SONY Xperia E1 D2005

First method:

1. Switch off your cell phone.
   
2. Then navigate to Settings -> Backup & reset -> Factory Data Reset -> Reset Phone -> Erase everything.
3. Now accept all informations.
4. That's all.

Second method:

1. Download and install program named 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. Power off your device.
   
4. Press and hold Volume Down, and connect to USB cable.
   
5. Now accept all info.
6. Finito!

Third method:

1. First you should download PC Companion, in example from here:http://www.sonymobile.com/gb/tools/pc-companion/
2. Install it and run.
3. Next you will see window with 4 options.
   
4. Choose option "Support Zone New!", and click "Start".
   
5. Wait for the program to install the appropriate add-on.
6. After that you will see next window with 3 options.
   
7. Goto option "Phone / Tablet Software Update", and click "Start".
8. Select "repair my phone / tablet".
   
9. Now follow the instructions and accept all informations. 
   
   
10. Please be patient and wait until preparing computer for software update is complete.
    
11. Afterwards choose your phone / tablet model.
    
12. If you see this window, then connect your device into your PC.
    
13. Done!

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