In order to hard reset a Nokia Lumia 930, 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 930 device will be brought back to the default configuration of a brand new device.
1. Heyoo. Start by pressing the Power button until the phone turns off.
2. Now press & hold the Volume Down and Power and Camera buttons.
3. Let go of the Power button when the phone vibrates.
4. Device will now reset and restart, thus completing the process. Done.