It will remove all the data ,contacts and apps that you installed
At the very beginning hold down the Power key in order to switch off the device.
Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds.
You should release all buttons when the Samsung Logo appears on the phones screen.
In the next step select from menu "wipe data / factory reset" using Volume buttons to navigate and Home button to confirm.
Choose "Yes -- delete all user data" to confirm the whole operation.
After that select option "reboot system now".
Well done! The hard reset has just been performed.
Start by turninng on the device by using the Power key
From the Home Screen go to Menu and then to Settings.
Tap Backup & Reset and then Factory data reset.
Afterwards choose Reset device.
To confirm your choice select Erase everything.
That's all! Your phone is ready to use.
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Restore Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.