It's to be expected, that, as the conversion rolls out, some unforeseen, and typically-minor "edge case" bugs will pop up and get fixed ASAP. So, there are likely to be frequent firmware revisions.
Rather than try to figure out which version to download manually, or to try to guess what the non-existent change logs would say, I recommend just letting the system do the work. If, at some point, a bug is serious enough to warrant a subsequent update, they'll push it out (again).