@DNSB It seems that Rakuten forgot that I have an account. So I created a new account with the old email and it worked. I also managed to un-brick the Kobo now. But the wifi issue still persists. The thing is, it does not show ANY wifi network, not only mine. As I said, I even created a hotspot, and that also was not seen.
At least I can sideload books now via Calibre (or directly).
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