I've just had to replace a system board on a Zoll M series due to ECG fault 4. The donour board came from a machine who's high voltage system was dead . Unfortunatley we don't know the configuration pass code from the previous owner of tge donor machine. How can I reset this code? Also the donor machine didn't have the etco2 module plug on it. I have connected up the etco2 but the newly fitted board isnt aware of it. Can i activate this somehow or do i need to reprograme the software to do this? Its not important anyway as i dont have the module for it.