press the Volume Down key. press the Power key. press the Volume Down key. Then your Nokia Lumia 521 will automatically reset. Note: During the resetting of your device, there will be two gears rotating on the display for up to 5 minutes. The display will then go blank for about 30 seconds and your handset will reboot. Steps and process on how to reset your Nokia Lumia 1520 to factory settings. Reset will wipe off all the data in the phone, so make sure you take a backup. Nokia Glance Screen ('glance' in the display+touch Settings module) offers the option of having an always-on clock displayed on screen when your device is fully locked (i.e. when the screen would bGBu1T0.