Don't even try of it, if your phone has flyme 6. You would get a dead device then. Even flyme 5 is also not that friendly to install twrp and other custom stuff. You have to have flyme 4.5 intl to install all. of that and that's a pretty hard thing in meizu because flyme has locked many thing that will end up your phone.

Go to XDA.

Downgrade to Flyme4.5, root, unlock, brush in