I had a look at the website for firmware, as uts666 suggested (and that'll be here, as you'd expect, and probably not here, as you might hope).
It doesn't appear to mention the LVW-5045. Doesn't show up on the search engine. It's not listed under any of the download options. Existing products don't appear to include such things at all, although the new products page mentions some different models. So, what a crap website. At least Google found it.
I'll have a fiddle with that one tomorrow, when I'm at a machine which has a combination of net connection and working (USB or CD writer).