In order to hard reset a Ematic EGS004, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Ematic EGS004 device will be brought back to the default configuration of a brand new device.
1. Switch off the smartphone by pressing and holding the Power button.
2. Starting from the Settings, select Backup & Reset and Factory data reset.
3. Continue by selecting Reset device and Erase everything. Voila, done.