Thakns for your answers.
I have redmi note 4 x20 (mediatek) device for one week, so I can say Im new on this.
I read (maybe is wrong) bootloader unlock is possible only on Chinese roms, is that right?
My actual rom MIUI Global 8.0.4.0 MBFMIDG (with some menus on chinese, lol).
Can you help...