BE25 router fails to link with wired E4R unit

The most likely cause is that the BE25 and the E4R are not on the same network or are not set up as a mesh pair, so the wired unit never gets handed the right settings. I can't confirm the exact model details, so treat these steps as the general approach. 1. Power-cycle both devices. Unplug the BE25 and the E4R, wait 30 seconds, then plug the BE25 in first and wait about two minutes before plugging in the E4R. 2. Check the cable. Use a known-good Ethernet cable and plug it into a LAN port on the E4R, not the WAN or internet port. Look for a link light on both ends. 3. Confirm the E4R is a wired extension, not a separate router. If both devices are running their own DHCP servers with different address ranges, they will fight. Log into the E4R's admin page and make sure it is set to access point or mesh mode, not router mode. 4. Use the maker's app to add the unit. Most mesh or extender products pair through their official app. On your phone, open the app, choose add device or add node, and follow the prompts. Pairing from the app is often required even for wired units. 5. Check the network name and password. On the BE25, go to its settings and confirm the Wi-Fi name and password match what the E4R expects. If the E4R was previously set up elsewhere, factory-reset it (usually a button held for about 10 seconds) and pair it again. 6. On Windows, open Command Prompt and run ipconfig. On macOS, open Terminal and run ifconfig. Check that the wired device has an address in the same range as the BE25, such as 192.168.x.x, and not 169.254.x.x, which means it got no address. 7. Update the firmware on both devices through the app or admin page, then retry pairing. If none of this works: check the exact firmware versions and the model numbers printed on each device, then contact the manufacturer's support with those details and a description of which steps you tried.