In order to hard reset a Celkon C205, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Celkon C205 device will be brought back to the default configuration of a brand new device.
1. Make sure that your phone is turned on.
2. Go to Menu > Settings > Reset > Master Reset.
3. Select Yes and, lastly, enter the 1234 safety code into the phone.
4. Woohoo, the hard reset is complete (or, at least, completing as we speak).