Downgrade from 5.1.8.0Y

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2

2016-08-03 21:14

Hi.
My wife just has updated her M2 Mini from international 4.5.x.I to 5.1.8.0Y. There are now only chinese and english languages on the phone. All apps are english, too. How can we downgrade to an international Firmware?
I downloaded last 5.1.6.0G. But device says "firmware corrupt". Is There a way to change Phone ID?
How to enable root permission on device? Flyme Account is connected, but no root options in settings...
Thanks