I just ended up with one of these junk version. Be careful, I might just put it up on eBay to pass it off to someone else.

I have yet another MX-3000 that has a pin much like the one you need and I do have a cable that works for it. I suspect the previous owner broke the outside of the connector to make it fit. It fits really loose and the cable that I have seems to fit the pins and in the correct order. It works.

I can't image there is a third cable set up, but I have what looks like three different ones. One is the standard mini USB that is so common, another much like what you need and a third that is very close but not the exact same. I will have to look closer at the latter two to see if they actually are the same and one was "modified".