thaibv, ISO3200 now works, and I was unable to hang the camera (for now)
there's one problem left: somehow after changing ISO to a non standard one, you cannot change to ISO 100; as a software developer, without looking through the source code, it is as if the menu code does not notice the change to ISO 100 because it shows it as the default selected option whenever you have a non-standard ISO selected
of course, you can change to another stardard ISO (200, 400...) and then go to ISO 100, just move the menu selection