[Support]Meizu c9 8.2.1.0G downgraded to any older version

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2018-12-27 00:50

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I bought new Meizu c9 last week it's run with android 8 oreo with firmware(build number) 8.2.1.0G. I'm not satisfied with this firmware, I want to downgrade to any other versions. Is this possible,  how can I do that?    Screenshot_20181226-221818.png