How to fix Guest Mode on mx5 and pro 5

Iam from vietnam
sorry English my bad
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some users are stuck in guest mode following will guide fixing

Step1: flash rom 4.5
Step2: install rom 5.1.6.0A
Step3: root devices
Step4: use flashfire flash rom 5.1.6.0G

Done You have succeeded, and also root
video use flashfire flash rom meizu pro5 or MX5

https://www.youtube.com/watch?v=WuZGAxhZhQQ

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