In order to hard reset a Mitsubishi M520, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Mitsubishi M520 device will be brought back to the default configuration of a brand new device.
1. For starters, power up the phone.
2. Now please, type in one of these sequences: *#77218114# or *#9426*357# or *#19912006# or *#881188# or *#94267357# or *#118811# or *#3646633#
3. Your phone will now reset'n'restart. Ta-damm.