Ok, but when I inserted the card - with the two data files - into my XH2 and selected update of the lens, the answer is "New update cannot be found. Turn off the camera."
When downloading the latest firmware for the Fuji 16-55/2.8, I don't get a zip file but instead a folder (XFUP0019) containing two files. (XFUP0019.DAT and XFUP0064.DAT). Why?