WiFi extender no5 recognized by the Comcast router
I have to use WiFi extender bc Comcast modem own WiFi signal is too week upstairs. I got linksys re6700 and able to connect through it on either 2.4 or 5GHz channel, but signal is still -74dB for 5Ghz so data rate is no5 optimal, so I want to increase it. I see option in Comcast Arris modem setup page to recognize / connect to WiFi extender but it shows no extender found even though extende working fine. How do I fix this? Also how do I change WiFi channel on the comcast router?