An appliance includes an external communication port, such as an RJ45 port, and a wireless communication module in wireless communication with a remote server through an external network. A controller is configured to receive, using the wireless communication module, a secure unlock command from a remote server, the secure unlock command being generated when a remote service device transmits appliance identification data to the remote server, and unlock the external communication port to permit the remote service device to access operating software through the external communication port.