I had this and had to reload software several times b4 it finally worked !! I also found that reloading software and leaving it off network then giving it ip settings b4 connecting to network helped
The solution was to enable Boot Server on the console. Then using the 3 fingered salute to reboot the DP while on HogNet. Easy........if you know how.....
The force software reload needs Bootserver and DHCP enabled as the whole boot-routine and software installation is done via network. Another option would be to create an DP8K software USB stick. This method also does a full-install for the software on the DP
