I believe you're right, pablot. It would be an interesting thing to try to hack the 80GB sysinfo on it (after all, you can easily swap hard drives), then apply the 80GB ver. update, and see if it give you BC. Of course, you'd probably need an infectus (or something similar) to do it.
I remember a while back c4e said he was going to look (keyword: look) at the ps3 firmware... I wonder if this was one of the aspects he was going to look at.