[Update] I could not power off; the device was locked on the screen where it tries to connect to the Kobo desktop (which did not recognize the device) - even when I disconnected it, it was stuck on that screen.
However, I _could_ perform a factory rest.
Eventually, Kobo desktop recognizes the device and then immediately gives ae an "oops! something unexpected happened" message, followed by "let's try that again" - at which point, it hangs.
So, I guess I need to try the image file...
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