I just currently tried to activate a code and entered the mac address with lower case and it said that mac was already in use. I then tried with upper case and it went through. But when I entered the information into the box, it would not authorize. Reading on this thread that people were adding their username/password information, I tried it also. It still would not authorize, so I went back and changed the mac address to lowercase in change mac address at rocket and then without using the username/password the unit authorized. Hope this can help some people.