In order to hard reset a Elephone S8, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Elephone S8 device will be brought back to the default configuration of a brand new device.
1. Press the Power button until the phone turns off.
2. Press and hold the Power and Volume Up buttons. Release them after a change occurs on the screen.
3. Wait for the Android Robot to appear and press Volume Up and Power again.
4. Now select the wipe data/factory reset option. To do so, use Volume and Power buttons.
5. Select Yes.
6. Lastly, select the reboot system now with, again, Power button.