The SSD drive on my X3 Pro crashed, so I hade to do a clean Windows 10 install on a new SSD. Gearbest surprised me by refunding USD80 without returning any hardware. This almost covered for the cost of a new SSD. Anyway, I got my X3 up and running again after some problems finding the last drivers. I didn´t think about it more, until today by chance I discovered that I now have a Windows 10 Pro instead of the Home version originally supplied. Apparently, the Windows license is good for the Pro version.
There is of course no guarantee that this applies to all X3 shipped, but any X3 owner, who has a need for Windows 10 Pro, might be interested to know.