From the info you gave about your WDTV FW, you seem to be using the corrrect version.
At the moment, I am trying to scan through that thread, but the googleads are preventing the page from loading fully and I can't open page 2 at all. I will try again tomorrow.
It certainly looks as if not everyone is having success with the hack, yet others appear to be running it successfully.
Sorry that I can help first hand. As I explained in my PM to you, I don't have a WDTV myself and therefore am relying on informstion I can find online.
If other WDTV users want to try this hack and contribute to the thread, we would all be very grateful.