friends today Meizu released flyme6 global stable version but after installing everyone was getting boot loops or it got stucked in Meizu branding so don't worry about that I will give solution

first of all download the version which was installed earlier in your phone and keep that file in your PC or in laptop
and then just press power+volume up and you will get recovery mode
after that connect your phone with PC or laptop
then copy update zip and paste into Meizu folder which will appear after connection your phone with data cable
after pasting click on system update and then click start
and thats it wait for some time then your phone will be optimised and now enjoy.....