In order to hard reset a DGM T-825QI, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
DGM T-825QI device will be brought back to the default configuration of a brand new device.
1. Power up the phone: press-hold the Power button.
2. Starting from the Main Menu, open enter Settings.
3. Now select Backup & Reset, Factory Data Reset and Reset Device.
4. Lastly, select Erase Everything. Done!