Firmware corrupted

[Stefan Schumacher]

Hello,

I just got my OneRNG-Key (Hardware Version 3.0) and I have some trouble getting it to work. The system I am using is Debian 10.I have installed the dependencies (rng-tools at python-gnupg openssl) and the onerng_3.6-1_all.deb-file. 
The light on the device goes on when I stick into an USB Slot.  Dmesg shows that it found the device: [304146.977222] cdc_acm 1-10.1:1.0: ttyACM0: USB ACM device as well as lsbusb: Bus 001 Device 040: ID 1d50:6086 OpenMoko, Inc. OneRNG entropy device

Unfortunately rng-tools refuses to start. I does not show any error messages one could work with. The only thing which I noticed quite by accident was this message from atd:
OneRNG[11603]: firmware verification failed: Bad image
Executing /sbin/onerng.sh does not produce any output nor start a daemon.

I am grateful for any suggestions on to get this working.

Yours sincerely
Stefan