Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
Does "everything" include connecting to a different network, like a WiFi hotspot on your phone or a friend or neighbor's network, to see if it will allow you to complete the setup? A number of people have reported it worked for them, and then they could redo the net connection to connect to their home network. Not everyone who has tried this has reported success, but then most people never report back.
Let us know how you make out.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T