Thanks for your answer! I'll give the MOSLO kernel another try. Today I was not sure, what to expect. Should the device boot into some kind of command line or is this "Warning you modified your device" screen the final state?

The README says you should do "sudo ifconfig usb0 192.168.2.14" -- do you remember, if one needs a special kernel module? The default debian kernel does not offer a network device usb0...