Ok, I found out that you can relay - via USB - into the RPi zero. And it seems that I able to connect to the Pi.

Strangely enough, when I try to log in with the standard settings: pi as username and raspberry as pw, I always get access denied... Do you happen to know of any way to predefine the standard user?

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With the SeedSigner 0.7.0 image you would not be able to ssh in. However if you want to go down the dev build/troubleshooting route, you can build an image that does have networking/ssh. https://github.com/SeedSigner/seedsigner/blob/dev/docs/manual_installation.md

and

https://github.com/SeedSigner/seedsigner/blob/dev/docs/usb_relay.md

are good resources to do a “manual” build of a dev image that includes networking/shell access.