1. Press and hold the Power button to turn off the phone. 

2. Press the Volume Up & Power buttons simultanously. Release it when the Android logo pops up.

3. Now enter Recovery Mode by press-holding Power.

4. Select the wipe data/factory reset option. Navigate to it with Volume and select with Power button.


5. Press Power to confirm by selecting Yes.

6. Lastly, select reboot system now. Done.