It will remove all the data ,contacts and apps that you installed
At the beginning switch off your phone by holding the Power button.
Afterwards press and hold the Volume Down + Power key at the same time for a few seconds.
You can release held keys when you see the Bootloader Mode.
Then use Volume Down to select "Factory reset", and press Power button to confirm this option.
Well done! The hard reset has just been performed.
Firstly turn on the phone by using the Power button.
Afterwards go to Settings and then to Backup & Reset.
In the next step tap Reset Phone.
Then choose Erase All Data if you are sure you want to clear all your data.
Select OK to begin the whole operation.
Godd job! Wait to complete the hard reset process.
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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.