In order to hard reset a Diman DM-K630i, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Diman DM-K630i device will be brought back to the default configuration of a brand new device.
1. Switch on the device by pressing and holding the Power button.
2. Starting from Home Screen, go to Menu and Settings.
3. Select Reset, Master Reset and, lastly, Yes.
4. Start the hard reset by typing in the safety code 1234.