I also have a meizu m3 mini with Chinese firmware (YunOS).
I have found the guide to root the phone https://forum.meizufans.eu/topic/5794/tutorial-how-to-root-your-meizu-m3-mini
But now i want a global (international) firmware to install but there’s nothing?
I am having problems with several apps wich are blocked on Chinese firmware.
I have a M2 mini wich i changed from chinese A version to I version.
It’s working perfect with all my apps.