In order to hard reset a BLU Brilliant, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
BLU Brilliant device will be brought back to the default configuration of a brand new device.
1. Switch the phone on.
2. Time to go through some options. Starting from the Menu, go to Privacy -> Factory Data Reset. There, select Reset phone.
3. Your phone will now reset, just accept the incoming messages.