Why doesn’t my router support 2.4ghz despite it lighting up?

Hey there, user_ct59a8, thanks for reaching out through Xfinity Forums. We want to ensure that you are able to connect all of your devices. Here is a link with the steps to change your WiFi channel selection, https://www.xfinity.com/support/articles/change-wifi-mode-admin-tool-xfinity-xfi. Let me know if this information helps!