Since D-Link decided AFTER initially marketing the first COVR system as "expandable," to NOT grant the ability to purchase additional Extenders, I had to buy a complete 2nd system to gain the extra Extender. I know how to add a spare Router to a standard wireless network as an Access Point by changing the 2nd Router's IP (in same subnet), disabling DHCP, and choosing a different SSID. Those are the old days, and today we have MESH. Does anyone know how to add my spare COVR-2600R Router to my working, in-production MESH network comprised of one COVR-2600R Router and two COVR-1300E Extender's?