I managed to scan 2-3 times, then waited for the MacOS version of HandyScan. Once connected via wifi (using my phone as the hotspot), I changed the wifi settings using HandyScan, to connected it directly to the notebook. My assumption was, that renaming the wifi should work.
Since then it does not connect anymore.
The POP seems to work to a certain degree via USB with Windows10 running in a Virtual machine (the depth sensor does not activate though). I can change the wifi settings and click on the “restart” button to restart the device, but it never connects to any network I provide (neither to hotspot, router, or notebook). When I open the dialog again I can see the changed wifi settings (so I assume the dialog works, as well as saving the new wifi settings), but even with the original POP/12345678 settings which worked on my phone, it does not connect anymore.
This means the POP is unusable for me right now.
How can I get the device to work again?