Samsung

  Easy method: At the very beginning turn off the phone by holding the Power button. Then press and hold together Home button + Volume Up button + Power button until the phone vibrates. After Vibration release All Button. After a few seconds you will see little man Android and after that menu recover Option . In the menu choose with Volume Down buttons "wipe data/factory reset" and select it by pressing Power button. Confirm the whole operation by tapping “yes-delete all user data”. Next select option “reboot system now” done ! your device now restart .   :idea: Remember ! when you hard reset to your smartphone, you must backup your all data, because after hard reset you lost your all important data from internal memory.We provide a link how to Backup Android Device