Hard Reset GIONEE Elife E7 Mini

First method:

1. The device must be turned off, so press and hold Power rocker.
2. After that, hold down for a couple of seconds two buttons: Volume Up + Power.
3. Release held keys when you see an Android Recovery Mode.
4. Select the "Wipe data / Factory reset" by using the Volume buttons and press thePower key for confirmation.
5. Then choose "Yes--delete all user data". Use Volume Down to scroll and Power button to select.
6. To restart the phone, select "reboot system now".
7. Success! The hard reset has just been performed.

Second method:

1. Turn on the phone by using the Power button. 
2. Go to Settings and then to Backup & Reset.
3. Find and select Factory data reset.
4. Choose Reset device and select Erase everything.