Hard Reset SONY Xperia E4 E2115

First method:

1. At the beginning switch on the phone by using the Power button. 
2. Afterwards go to Settings and then to Backup & reset.
3. Tap Reset Phone. 
4. Choose Erase Everything if you are sure you want to clear all your data. 
5. Select OK to confirm the whole operation.
6. Well done!

Second method:

1. Firstly, 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. Afterwards turn your device off.
   
4. Then press and hold Volume Down, and connect to USB cable.
   
5. Follow the instructions on your screen, and accept appropriate options.
6. Success!

Third method:

1. Switch off your cell phone.
   
2. Next hold and press Power button + Volume Up for about few seconds.
   
3. Release them, when you see menu on your screen.
4. Now follow the instructions on your screen.

Fourth 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. Go to 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!

Fifth method:

1. Switch on your device.
   
2. Afterwards press Call button, and type: *#*#7378423#*#*
3. Then you will see menu.
4. From this menu choose option Customization Settings -> Reset customization.
5. Confirm information: "data will be cleared and factory data reset will perform".
6. Accept with pressing Reset customization and reboot.
7. Please be patient -> your device will reset and reboots.

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