which OS should I upgrade to from 5.1.4.0Y

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2017-09-30 16:59

hello,
I have the Meizu M3 running FLYME OS 5.1.4.0Y
Powered by YunOS 3.1.6

Could anyone tell me what OS version i should upgrade to as my phone is starting to slow down and many apps are not loading making it un-usable and want to check if it is because it needs an update

Thank you