In order to hard reset a Sagem MC 820, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sagem MC 820 device will be brought back to the default configuration of a brand new device.
1. Hello. Start by switching on the phone.
2. Now enter Menu and continue to Settings, Networks, Phone and Reset.
3. Complete the hard reset by selecting Yes. Done! Phone should now reset and restart.