In order to hard reset a Gresso Sol Steel, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Gresso Sol Steel device will be brought back to the default configuration of a brand new device.
1. Press the Power button until the phone turns on.
2. Open Menu > Settings > Reset > Master Reset.
3. Lastly, select Yes and the safety code 1234.
4. The hard reset is complete.