Have any details? If it's a Japanese plug and play (one by Epoch or the like) then yeah there's quite a high chance of it being XaviX or Super XaviX. There are at least 100 Japanese things using the tech, maybe more, we have no source for the majority of them. There are Chinese / Korean versions of some of the plug and play gimmick devices too which clearly used different ROM as there's no support for such languages in the ones we have.