Helge,
You're absolutely right that at least the hardware needs to be open in order for it to be useful. In my last message this completely slipped my mind. I will be posting the schematic for the mc-Mod110, mc-Mod120 and mc-Dev on the forum today and we will be putting it on the website next week.
Apologies for the bad communications.
On another note we just released a new OTA updater that should be able to recover your device.
As always, let us know if you have any further questions or comments.
Regards,
-Tom-