I had a helpful reply from Oliver on the updating problem I was having. I thought I'd post on it here in case anyone else has the same problem.
As the counter in the Chrome update tool was counting up fine then communication with the adapter was working fine, but as the update wasn't making it to my DMG, I have a connection problem maybe with the DMG itself or maybe my DMG-04 cable. I've not had a chance to have another go yet.
The fact that my 'hello' was replaced by a black bar is what happens when you press the start+select to get the 'n' displaying on the screen. Doing that clears the update area and in the process erases the 'hello' message.
Oliver added that: "It's also important to keep the right order: First load the file, then press SELECT+START and then click send."
I'm going to have another go hopefully this weekend. Cheers, Teamoth.