This is a reply I got from my vendor concerning a recently acquired BCM,they stated that you have to have Element Manager to log in to a BCM 4.0 thru the serial interface, I thought it may only be necessary to connect via the LAN. I just purchased a BCM that was upgraded from 3.7 to 4.0 prior to me receiving it and neither the LAN or serial interface will accept the default passwords. Any help is greatly appreciated.