Copy VM from ESXi 5 to ESXi 4?

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http://serverfault.com – Searched Serverfault (and Google) for this, haven't been able to find an answer... We copied a VM (folder and files) from an ESXi 5.0 server (5.0.0-623860) to an ESXi 4.0 server (4.0.0-261974). (Also, the 5.0 server is licensed, and the 4.0 server is the free version.) Now when we try to start the VM on the 4.0 server, we are getting a popup error "Invalid virtual machine configuration." Looking at the 4.0 server's logs, it is complaining of "Invalid value '/dev/char/serial/uart0' for configuration key serial0.FileName'. Value was not accepted by rule 'Virtual Serial Port Device backend'." ( (HowTos)