LOL. Had to check out what was on the bottom!Interesting. I don't know what the point of turning it upside down as one of the first things you did with the camera was supposed to do ... ?? ... Did you do that with the X1D II as well? LOL!
I'm thinking that is the situation. I had not touched the camera since yesterday and when powered up this morning, it was in 500 series camera body mode again. My cameras are always turned off before changing lenses (or removing the back as in this case). I am going to clean all of the contacts.It sounds like the back or the lens wasn't fully, securely attached on the 907x, or it hadn't fully initialized itself, or a contact pin wasn't fully engaged, or something like that. There are a lot of contact pins between the body and the back... If powering off then powering it back on has solved the issue and it has't returned, I suspect it might have just been a "new, out of the box glitch." That is, "stuff happens."
The camera body icon is obviously new - I can't figure out a way to force it to revert to 907 body mode within that list of items. Otherwise, the remainder are the same.What about the 907x is not like the X1D II with respect to the touch screen interface? Most of that should work pretty much the same, although the X1D has hard controls for mode settings, etc, that might be a divergence. When it comes to the hard controls, well, they're a bit different.