At First Backup your all data like contact, message, videos, photos etc. remove sim card and memory card. Make sure your call phone battery is not empty.
1.Turn Off Your Device First.
2.Now Press and hold Volume Up + Home + Power Key To Turn On Your Smart phone.
3. When Samsung logo appear on screen Release all hold keys.
4. use volume down key to select this "wipe data/factory reset" and pressing power key to confirm.
5. Now You need to select this "Yes -- delete all user data" confirm it pressing power key.
6. in this last step you need to select this "reboot system now"
Done.
2.Now Press and hold Volume Up + Home + Power Key To Turn On Your Smart phone.
3. When Samsung logo appear on screen Release all hold keys.
4. use volume down key to select this "wipe data/factory reset" and pressing power key to confirm.
