ZyXel ZyWALL USG 20W Wireless Unified Security Gateway Reset to factory defaults. Please note: the Ethernet address on the label is faded and not readable. We do not know enough about thetechnical aspectof these to know if this will affect set up. So we ask that potential buyersbe able to work around this (or use someone who knows). The serial number is still readable, and setup should be able to be done through the interface, but we are not able to provide any support in this. Thanks for understanding.