It will remove all the data ,contacts and apps that you installed
Start by switching off your device.
Afterwards press and hold Volume Down + Power button for a while.
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 switch on the device.
From the Home Screen go to Menu and then to Settings.
Tap Backup & Reset and then Factory data reset.
Afterwards choose Reset device.
To confirm your choice select Erase everything.
Success! Your phone is ready to use.
HTC First Restore Factory Hard Reset Format Phone.So lets start the HTC First Restore Factory, HTC First Hard Reset.Turn Off the mobile phone for few mints.HTC First Remove Pattern Lock.
Hard Reset,Restart Problem,Restart Solution,Restore Factory,
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.