I changed Power control board and Gas mixer electronic of avance anesteshia machine with software 3.0v then upgraded 3.20v. everything okay up here. but options of the device did not fully. Mode only has volume control. others mode has not Pressure control mode, SIM. configurations using the service menu of device , I entered the option key on the back of the device but the message is invalid. I have to bring these options back. I need help.