So Guys I have discovered the easiest way to open the root permission in meizu devices.Follow all the steps carefully ..
1. Goto settings and backup your contacts.
2. Enter into your contact lists and delete all contacts
3. Now exit and re-enter the contact lists, you will find options (a) sync contacts (b) import contacts etc.... click on (a) and sign in into       your meizu with your flyme account.
4. Now click and your account picture and when it takes you to another page with options select SECURITY and tap OPEN.
    /......\ then your phone will reboot after you finished. ...hence its the easiest way.... Done.
and you can use the same way to unroot (just close the security option)
Hope i helped some you desparades out there trynna root ya phone.