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The only way is to install the China dev rom with the deep flash cable and then unlock the bootloader. Or wait for a new version of the global ROM to come out and have that option

The problem is in the ROM and not in the servers. The global ROM is not allowed to unlock the bootloader. In the development options you do not have the option to unlock bootloader and the phone can not communicate properly with the computer in fastboot, being unable to verify the MI account...

I had the same problem. The only solution is to use the deep cable to install the dev china ROM by edl. After installing this ROM already fails to give errors to unlock the bootloader