It will remove all the data ,contacts and apps that you installed
First, switch off the phone by using the Power button.
Afterwards press and hold Volum Down and Power buttons together for a couple of seconds.
You can release held keys when you see Bootloader Mode.
Then press Volume Down to select option "Factory reset", and press Power button to confirm.
Good job! The hard reset has just been perfomed!
Turn on the phone by using the Power button.
After pressing the Home button go to Settings and then to Security.
Select the Factory Data Reset and choose Reset Phone.
Tap Erase Everything to confirm the whole 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.