Hard Reset LG D821 Nexus 5

1. Press Power button to switch off device. 
2. Press and hold Volume Down + Power button. 
3. When LG logo will appear on screen release buttons.
4. You will enter the Android system recovery menu.
5. Use Volume Rockers to navigate on wipe data/factory reset and press Power keyto select it. 
6. After the data wipe is complete, press the down Volume Key to scroll to reboot system now and press Power key to select it.
7. Done device is ready to use.

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.