I can't help with the WiFi connection, but...
If you are only using KOreader on a Kobo device, and never using nickel, my recommendation is to disable the KoboTouch driver and use either the Folder Device Interface driver or the User Defined USB driver. The KoboTouch driver uses the database on the device to get the list of books. If you don't start nickel, there will be no books in the database. The others will scan the device for books.
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