Tnx for trying to help: that was the first thing I checked, but apparently this is not the problem, because I get the same error when I'm setting the ip on the dm500s to another address.
I cant install it, nothing happends !! I did a "erase" in dreamup before, and then installed the img. Restart and nothing happends. What have I done wrong ?
I reinstalled the hydra Zeus img, and it works just OK.