Plz Help: 014.30 error code
Both the Roku Ultra and the Roku Express 3960 are dual-band devices. To see which band your devices are using from within Roku, you can go to Settings/Network/About.
From here, you can look at "Wireless Channel". For the 2.4ghz band, you will see a channel between 1 and 11. For the 5ghz band, you will see a channel 36-48, or 149-165.
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In order to change the settings for the TG1682, you can either login to the router or use the Xfi app. Follow the instructions from this Xfinity link and post back if you have any questions.
https://www.xfinity.com/support/articles/change-wifi-mode-admin-tool-xfinity-xfi
Make sure you see the 2.4ghz radios enabled, that you change/Edit the Wireless Mode to b/g/n, and that you restart both the router and your Roku devices after making the changes. The ability to change settings should be available for this router, but in case Xfinity has now blocked this router from accepting changes (options greyed out), you will need to contact Xfinity to make the changes for you. I have not seen reports that they have removed the ability to change this router though, so you should be good to go.
Here is a walkthrough so you know what to expect and see what you are doing, from a previous thread of this particular issue. https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m-p/749057#M21380
