Sorry if this has been asked many times, but I've done several searches and I can't find a good answer to my question. I have a series 2 Tivo with lifetime service. I'd like to get an HD tivo. Is there a way to trick the HD tivo into thinking that it's the series 2 tivo, so that it keeps the subscription? Or, is it possible to modify my series 2 so that it records HD? Thanks!