In order to hard reset a Nokia Lumia 928, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Nokia Lumia 928 device will be brought back to the default configuration of a brand new device.
1. Switch off the phone by press-holding the Power button.
2. Now press and hold the: Volume Up + Camera + Power buttons.
3. Let go of the Power button when the phone vibrates.
4. Phone will now reset and restart, completing the hard reset. Done.