Revert back of Flyme 6.3.0.2A to G firmware in meizu m3 note

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2018-03-27 01:13

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Currently i am using Meizu M3 note, Flyme 6.3.0.2 A. I  want to revert back to Global firmware due to bugs (battery drain, apps are not opeining properly, google contacts sync problem, etc).
Can any one suggest me to which version of OS can i use to revert back.