Before returning it, I'd double check that everything is correct to log onto your network. One thing often overlooked is if you ever set up a whitelist for your router and then forgot about it, your wifi will just keep denying the connection and possibly not give you any message about it either (at least that's what it did to me, no message, nothing). You'll have to be sure and add the new reader to the whitelist, you can get the MAC address off the reader from Settings, Device Information. Or at least disable the whitelist for a few minutes to try and log on again.
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