Got it... And hey, the entire realm of documentation on this process said 770, incl. the d/l link from the flasher site, so excuuuuse me.

Look, thanks for the answer. Hopefully, a year from now when I see a post from a new-b trying to make sense of this poorly communicated process, I can be a bit more understanding than you come across as being. Of course, you did give me the answer I needed, and I'll likely need more answers, so I best not be too *****y and remember to express my sincere apprciation. If it wasn't for this community, there's no.way I would have considered this move at all.

And this whole post - written on the 800, with OS2007. Time to change that.