Hi there, sorry to hear about your problem,
please try some of the steps on this link
support.xbox.com/.../error-cant-connect-wireless-network-978945 you can try to reset the network to factory defaults,
If none of the solutions work it's likely your console is in need of a repair
The link to request a repair is available on the link about your problem.
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What happens when you select the Wired option and press A?
Unplug everything in your'e router, wait 30 seconds then plug the cords back in and there. :)