Refurbished: TP-Link Wi-Fi 6 Router AX1800 Smart Wi-Fi Router (Archer AX21) Dual Band Gigabit Router Black - Manufacturer Refurbished

Hi, Thank you for sharing your experience with our product. It sounds like your modem's MAC (Media Access Control) binding needed to be released and renewed so it could provide an IP address (and Internet) to the Router. This can typically be done using the following steps: 1. Unplug the power from both your router and cable modem 2. Unplug the coax cable from the modem 3. Re-connect power ONLY to your cable modem 4. Wait until the cable modem is fully booted, then re-connect coax 5. Re-connect power to the router and connect it to the modem via Ethernet This process should release and renew the MAC binding, so your modem can provide connectivity to the router. If you have any questions about TP-Link products in the future, please reach out to our official support team using any of the resources included with the product, or from our official website, and we'll gladly have a Support Agent follow up with you directly. Thank you, TP-Link Support