Dynadock 3.0 Ethernet not working regardless of OS used

To integrate a new Laptop into my Environment, I bought a Dynadock 3.0 yesterday - ideal designed with Gigabit-Ethernet and 5.1 Audio.
To support Windows 8.1 in perfect manner, I updated the Firmware at first to the December-Release, which may was a big mistake!
I didn't checked with the old one, but the new firmware looks faulty!
Every device is installed without an issue on 3 Notebooks (Win 7 x86, Win 7 x64 and Win 8.1 x64), but on none of this notebooks, the ethernet-device of the dynadock is working.
It is shown as correctly installed and working, but it is not receiving any package from Ethernet - just sending, if I believe the Network statistics of the OS. Nowhere I was able to find any hint to identify a driver-problem. As the ethernet-port is not receiving any answer from the dhcp-server, the OS shows a yellow "!" in the tray-symbol.
That is all.
I checked the same connection with an old USB-to-ethernet-adapter, which was successful.
So far, I guess, the FW is broken, because, if drivers are o.k. and connection is o.k. as well, the only other explaination would be, that the HW is broken, which seems to me less propable for a new device.
Any other Idea?
Similar experience? Advice?
Shall I send the device back, to get a new? Will there be a fix for FW available soon?
Can I reinstall the old FW (how)?
BR
Guido

> but on none of this notebooks, the ethernet-device of the dynadock is working.
First of all you have to download the latest software (compatible with Win 8.1) from displaylink page:
http://www.displaylink.com/support/downloads.php
You should read also the article about the upgrade to Win 8.1
http://www.displaylink.com/support/ticket.php?id=346
If LAN will not be recognized you should manually update the LAN driver of the Dynadock U3. For drivers search in folder: C:\Program Files\DisplayLink Core Software\
Also try to transfer the authentication settings from the internal to the external LAN card.
Just open the properties of the internal LAN card and choose the "Authentication" tab settings.
Now check the option called Enable IEEE 802.1x authentication for this network
For EAP type choose: EAP (PEAP)
Check also the option called Authenticate as computer when computer information is available
After applying the settings of this tab to the Dynadock LAN card, it should work without any problems.

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