It will remove all the data ,contacts and apps that you installed
Begin by switching off your device by holding down the Power key for a few moments.
Afterwards press and hold together the following buttons: Volume Up + Home + Power.
You should release held keys as soon as the Samsung logo appears on the screen.
Then select "wipe data / factory reset" by using Volume buttons to navigate and Power key to confirm.
In the next step choose "Yes -- delete all user data" to confirm whole operation.
When the Recovery Mode appears again select "reboot system now" by pressing the Power button.
Good job! The hard reset has just been performed.
If the display is off, press the Power button to turn it back on.
Afterwards go to Settings and then to Backup & Reset.
In the next step tap Factory reset device and Reset Devive.
Next, choose Erase Everything if you are sure you want to clear all your data.
Then select OK to confirm the whole operation.
Well done! The hard reset is done.
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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.