How to change m3 note firmware from chinese to global

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2017-09-29 19:39

I am using m3 note which is m91. I was using flyme 5.2.12.0G but yesterday i upgraded it to 6.2.0.0A in the seek of VoLte. But now when i tried to downgrade it again i got firmware error while it was in restore mode.
i already tried so many steps to do it but failed.
i rooted the device,
i installed supersu and terminal to change device id to global but it also didn't work.

please somebody help, i am frustated now.