This problem comes when you forget the lock pattern or when you forget the google or Samsung account password. Then we have no choice to solve this problem. We goes to repair center they said mobiles need new software and taking some charges. I am here with free solution to this problem how to factory data reset.
Perform a factory data reset only if absolutely necessary as it removes all data including:
System and app data
Media (Music, pictures and videos, etc.)
Factory Reset: Follow step one by one
- Simultaneously press and hold the Power button (located on the upper-right edge) + Volume Up button (located on the left edge near the top) + Home button (located at the bottom in the middle) until recovery booting appears in the upper-left part of the screen.
From the Android system recovery screen, select wipe data/factory reset.
- Select Yes — delete all user data.
Select reboot system now.