Hard Reset HTC Desire 516

First method:

1. Switch off the device.
2. Then press and hold Volume Up + Power button.
3. You can release held keys when you see the Android images.
4. Afterwards use the Volume Down button to choose wipe data/factory reset and then hold down the Power button to confirm your choice.
5. Browse to option "Yes-detele all user data", and confirm that with Power button.
6. Later press Power button to enter option "reboot system now".
7. Done!

Second method:

1. Turn on your cell phone.
2. Then from Main Menu go to Settings.
3. Choose Accounts and then to the Backup & reset.
4. Tap Factory data reset.
5. Find Reset phone and select it.
6. Mark Erase everything and press OK to confirm the whole operation.
7. Well done! The hard rest was just performed.

Third method:

1. Make sure, that your phone is on.
2. Afterwards from the main screen type: *2767*3855# and press call (be carefull this method won't give any option to reverse the process!).

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