Help unlocking bootloader.

Hello, I've received my Mi5 with the Official Global ROM. I wanted to unlock it and install custom roms but to unlock it I need to be on Chinese ROM which is a HUGE problem.
The thing is that I simply can't switch to Chinese in any way, I tried with the updater app, with miflash but don't work, with mipc suite but don't work..
If anyone can help me precisely please, I'm lost and I don't understand the methods with EDL, drivers installs...
Thanks a lot !

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