It will remove all the data ,contacts and apps that you installed
The device must be turned off, so hold down the Power key for a few seconds.
Afterwards press and hold Volume Down + Power button for a while.
You can release held keys when you see an Android menu on your screen.
Then press Volume Down to select option Factory reset, and press Power button to confirm.
Good job! The hard reset has just been performed.
At the very beginning hold down the Power button in order to switch on the device.
Then from Main Menu go to Settings and tap Storage.
Next choose Reset phone and select Erase all data.
After that, tap OK to confirm your choice.
Success! 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.