In order to hard reset a Motorola BRAVO MB520, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Motorola BRAVO MB520 device will be brought back to the default configuration of a brand new device.
1. Press-hold the Power button until the phone turns on.
2. Now enter Menu > Settings > Security.
3. You now need to enter Security Menu. To do this, tap in the lock code (0000 or 1234 by default).
4. You are almost done. Select Erase > Reset.
5. Good job, your phone should now reset and reboot.