How to downgrade from flyme A version to G

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2017-06-19 02:14

Hy I have a Meizu M5 Note M621M version and  he came with Flyme 5.6.11.0.0G . I make it update to Flyme OS 6.7.6.13beta (it is A version) and now i wish to came back to the old version 5.6.11.0.0G but i don't have this firmware and i can't find it. I try another version Flyme 5.2.11.1G from oficial site but faceing with a fimware error.Please help me to restore old firmware because i intend to return the phone.