Okay, then let's look at something more systemic.
If you go to Roku menu path Settings > Network > About, if the wireless channel indicated is 11 or lower you are connecting to wifi in the 2.4 GHz band. If so, your problem may have been caused by an update to your router which affects some Roku models. The update changes the router's wifi connection parameters for the 2.4 GHz band from b/g/n to g/n. This has been reported with equipment from Comcast/Xfinity and Cox, and more recently AT&T, but there may be others.
Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router 2.4 GHz configuration protocols from the g/n wifi set by the update back to b/g/n.
If you don't have access to your router's configuration controls or just don't know how to do this you may have to have your internet provider do it for you.
Step-by-step post from @AvsGunnar for Comcast/Xfinity users: https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...
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