This thread is for GIO users and this contains all secret keys for GIO.
1. Recovery Menu
Shutdown GIO and hold Center(Home) button and hold Power Key.
2. RAM Dump Mode
Shutdown GIO and hold Vol Up button and HOME button and Power Key.
3. Downloading Mode
Shutdown Gio and hold Vol Down and HOME button and Power Key.
Shutdown Gio and hold Vol UP&Down both keys and HOME button and Power Key.
5. Taking Screen Shot (no shutdown required)
Hold Center(Home) button and fastly click Power Key.
Note: If you hold HOME button for long time and press Power Key it will take screenshot of Recent Apps screen.