It will remove all the data ,contacts and apps that you installed
In order to switch off the device, hold down the Power button for a few seconds.
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.
First of all, switch on the phone by using the Power button.
Then from Main Menu go to Settings and tap SD & phone storage.
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.
HTC Desire HD Restore Factory Hard Reset Format Phone.So lets start the HTC Desire HD Restore Factory, HTC Desire HD Hard Reset.Turn Off the mobile phone for few mints.HTC Desire HD Remove Pattern Lock.
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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.