It will remove all the data ,contacts and apps that you installed
First of all, hold down the Power key for a short while in order to switch off the device.
Afterwards press and hold together: Volume Up + Home + Power button.
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 button to confirm.
Afterwards choose "Yes -- delete all user data" to confirm whole operation.
When the Recovery Mode appears again select "reboot system now".
Good job! The hard reset has just been performed.
If the display is off, hold down the Power key for a short while in order to turn the tablet back on.
Afterwards go to Settings and then to Backup & reset.
In the next step tap Factory reset device and Reset Devive.
Choose Erase Everything if you are sure you want to clear all your data.
After that, select OK to confirm the whole operation.
Well done! You have just performed the hard reset operation.
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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.