In order to hard reset a NEC e313, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
NEC e313 device will be brought back to the default configuration of a brand new device.
1. Turn on the phone.
2. Starting from the Home Screen, open Main Menu and Settings.
3. Now select Backup&Reset, Factory data reset and Reset phone.
4. Lastly, select Erase Everything and OK. Well done, the process is complete.