1) Turn off the device2) Now hold down the buttons volume up + power button for a few seconds (do not press the power button for a long time)3) Keep pressing the volume button up until you meet the "EMUI" image next to the Recovery mode.4) Go to the Wipe Data / Factory Reset option and confirm with the Power button.5) The procedure will take one or two minutes6) Now click on Reboot System NowThat is all. Remember that this procedure will delete all data from the device.