In order to hard reset a Mitsubishi M330, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Mitsubishi M330 device will be brought back to the default configuration of a brand new device.
1. Hold down the Power button until the device turns on.
2. Now tap in one of these codes: *#881188# or *#9426*357# or *#94267357# or *#19912006#
3. Device will now reset'n'restart.