So when you're going through the setup, you're able to connect your device to the extender but you're not able to connect the extender to the router?
Have you tried going in and changin the router's wireless password? Maybe something isn't compatible. Avoid special characters for the wifi password.
What I mean by hardwiring it taking an ethernet cable and connecting a pc/laptop to the extender for setup. Usually makes setup go smoother.
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