In order to hard reset a BLU Cubo, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BLU Cubo device will be brought back to the default configuration of a brand new device.
1. First, power up the phone by pressing the Power button.
2. Starting from the Home screen, go to Menu, Privacy, Factory Data Reset and, eventually, Reset phone.
3. A bunch of information windows will show. Confirm everything and the hard reset will complete.