Reset cell phone to its factory default settings is best way to boost mobile speed and remove all unwanted apps and data from phone. When we reset device then all data on mobile memory and installed apps and security locks will be deleted. This method is also useful in case of you have forgot your pattern lock and want to remove this screen pattern lock.
Make sure you have any important data backed up before apply this method. All data on your mobile memory will be remove like your contacts, messages, call history, installed apps and games. There are less chances to recover data if you have lost data. Many data recovery apps are available on play store but all data we have lost not be recovered fully.
Power off your phone.
Push together volume up+ power button until android logo appear
Select recovery with volume down key press and tap center key to confirm
Select with volume keys “wipe data/factory reset” and press volume up to confirm
Select “yes” and press volume up to confirm
Wait until format ends
Press volume up key to confirm “reboot”
Wait until the phone restarts