My Xiaomi mi 11 ultra bricked

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Hello everyone,After having tried to change the rom of my phone which had a global ROM (14.0.4.0TKAMIXM) in a ROM Europe to benefit HyperOS.I've not error blocked the phone in Fastboot and the operating system is no longer present. What's more, when I tried to pass the first ROM, I re-locked the bootloader.Now I have a non-functional phone with a locked bootloader and no functional ROM.Could someone here unlock the bootloader of this phone bought on AliExpress?Sincerely