I've noticed the same buy Last of the Mohican's really looked bad. As soon as I disabled the Dynamic Iris, the picture was fantastic and far brighter / higher contrast.
Sorry to say, but with the firmwareupdate you will loose all your settings and calibrations, you cannot store it; you have to note it;
on the other way I would recommend a new calibration. Firmwareupdate will also affect the videoprocessing. Settings based on the older firmware are often not okay with the new firmware
But doing the settings and the calibration new with the LUMIS running on the latest firmware, you will win in a better picture