In order to hard reset a Ericsson GF 768, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Ericsson GF 768 device will be brought back to the default configuration of a brand new device.
1. Turn on the device.
2. Now select Settings and Master Reset.
3. Type in the phone's lock code, 0000 by default.
4. Confirm. Done.