In order to hard reset a Mitsubishi m21i, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Mitsubishi m21i device will be brought back to the default configuration of a brand new device.
1. First, turn on the phone.
2. Type in one of these codes: *#881188# or *#19912006# or *#118811# or *#3646633# or *#77218114# or *#94267357#.
3. Your phone will reboot and restart. Well done! You are a technical genius.