I just did another attempt. Now with a Windows 7 Pro laptop connected by wire with. It is just the same as by my desktop computer.

The 218 isn't visible in the Device Manager, once in a while it flashes up and shows firmware 1 and then it's gone. The relay starting clicking again and no further thing happen.

UPDATE:

I have tried loading the firmware from a desktop thru the router and that didn't work. Then I tried using a laptop, wired to the same switch the 218 was on. That didn't work either.

I wired my laptop directly into the 218 and then it did the upload in seconds and everything went well.

DSP8000SE - 218 - Roon