As far as I know you can’t change this behaviour with an update. Use an editing software to combine the files. Perhaps you can merge them on your computer using a shell command, too (works sometimes, depending on the operating system and the underlying disc‘s format).
Rico Pfirstinger wrote some books on Fuji X-cameras incl. a few pages on DR. It's in all of his X-pert Tips books. Furthermore, cambridgeincolour.com has extensive explanation pages on all sorts of photographic topics. Just search on their site for dynamic range. The key is that you cannot correct blown-out highlights but it is easy to correct deep shadows in post processing. Cameras have two ways of addressing this: either an HDR-feature or an extended DR feature.
The extended DR-setting