That's indead a good question.
For being honest, I can't even remember how it was. There was the Special Firmware to download on the Website.
If I remember right ELC is a very small company so contacting the distributor in your country is often much faster than contacting them directly.
But, If you might have a look which firmware you're running I can check in my node if this is the latest one.
Best
Rolf
www.chaoscenter.net