Because international version is for international devices. You have the chinese device.
Hopefully, the 220.127.116.11A will be released soon.
If you really want the I version you can check this thread on xda: http://forum.xda-developers.com/android/development/meizu-install-rom-international-devices-t3174496
Okay, you can upgrade your MX5.
I tried myself, everything working. I can’t see any improvement anyway, maybe can be useful for me and the other italians because Meizu will remove our beautiful language from future versions.