Hello!
I got the phone with stable China ROM, I flashed dev. then unlocked bootloader, flashed TWRP, then EU ROM latest. 6.12.22 and installed latest SuperSU (UPDATE-SuperSU-v2.79-20161211114519.zip)
With china stable I could connect by usb cable to my pc WIN10 64 bit.
Now with EU rom and 2.79...