Press and hold the "Power" and "Volume Down" buttons simultaneously for 7 to 10 seconds. Once you feel a slight vibration, please press and hold the "Power + Bixby + Volume Up" buttons. When you see the Samsung logo, release all buttons, and the phone will enter the Android Recovery screen.
How to hard reset ZTE Grand X IN. Begin by switching off the phone by holding the Power key for a short while. In the next step press and hold Volume Up + Power button for a couple of seconds. You can release held keys when you see an Android Robot on your screen. Afterwards hold down the Power button for a short while to enter Recovery Mode.