I ran into a similar problem with a Kobo Mini. Here was my problem and solution. Maybe it's the same for you (can't guarantee that).
https://www.mobileread.com/forums/sh...ight=kobo+mini
Quote:
It (the Kobo Mini) had old software and, even though I could connect with its WiFi it would not (of course) update or register. I got out my only Windows half-computer (one Vista partition on the laptop, plus a Linux partition). I installed Kobo Desktop, it saw the Mini and tried to update, but it kept timing out. Never did figure out what the deal was with that.
So I downloaded the 4.19 firmware, hooked up to my Linux computer, and chose register via Kobo Desktop (on the Mini). At that point I could see the Kobo (on my Linux machine) so I copied over the update firmware, rebooted, and it updated. Then I was able to register it and download my books ...
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