Central locking issues

Hi everyone, just acquired an 2008 is220d and can't figure it out how to unlock all doors as at the moment only driver door its unlocking.<br />A bit messed up with how windows working too. Can anyone help?? <br />Note: I tryied already on my remote key to hold the opening and the <br />closing buttons together for about 10seconds as in YouTube short video and even displayed on my dash the car figure with all doors open but .. darn..still closed the other 3doors!