GCFFlasher_internal -l: no serial, no Product, where to find serial

I try to flash a new firmware to my RaspBee without success.

The serial number, Vendor and Product information dont show up. I have a picture of the case in which the device was send to me, but there is no serial number on it.

Where can I find the serial number of my device?

Thank you in advance.

Regards

Alexander