If something goes terribly wrong with your Samsung Focus windows phone or you just want to clear all the data before selling it to someone, you will want to hard reset it. Hard resetting, also known as Factory reset, wipes away all the data stored on the phone. So make sure you have all the critical data backed up before proceeding.
First, press and hold Camera, Volume Down, and Power buttons simultaneously. Then, release the Power button when the phone vibrates, but keep holding the Camera and Volume Down button. Release the Camera and Volume Down button when you see a ‘Format’ prompt on the display. Press the Windows Key two times to confirm the hard reset.