In order to hard reset a Sony Ericsson G705, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sony Ericsson G705 device will be brought back to the default configuration of a brand new device.
1. Switch on the phone.
2. Now select Menu > Settings > General > Master Reset > Reset All > Continue > Continue again > OK.
3. Select Delete all user installed applications > Delete > Yes.
4. Tap in the phone's lock code. Select Done. Done.