In order to hard reset a Motorola d520, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Motorola d520 device will be brought back to the default configuration of a brand new device.
1. Turn on the phone.
2. Enter Menu, select Setup and then Master Reset. Confirm.
3. Done. Your phone will now reset and restart.