In order to hard reset a Ericsson I 888, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Ericsson I 888 device will be brought back to the default configuration of a brand new device.
1. Switch on the device.
2. Open Settings and select Master Reset.
3. Now enter the phone's lock code (0000 by default).
4. Complete by confirming. Done.