Honor 7x unlock bootloader. HOW?

Hello!
I have Honor 7x BND-AL10 with CN locale and firmware 8.0.0.356(C00).
Bootloader closed.
I want to set EU locale and region firmware.
[SPOILER="Get Huawei bootloader password"]SigmaKey 2.29.20b1 HiSi: Get Huawei bootloader password
Connecting....
Android Adapter PCUI (COM183), Provider: Huawei Incorporated, Driver ver.: 2.0.6.725, Date: 28.12.2015, USB\Vid_12D1&Subclass_13&Prot_22
Firmware: System 8.0.0.046(0EUY), Date: Wed Jul 18 11:48:52 CST 2018, Provider: all/cn
Boot Version: System 8.0.0.046(0EUY)_BOOT, FastBoot Version: Chipset-dallas8.0.1.001(01AF)_FASTBOOT
Recovery Version: (unknow), System Version: System 8.0.0.046(0EUY)
Removing firmware protection...This Android security patch level is not supported.
Please wait for future updates.[/SPOILER]
Firmware have latest security.
Try downgade to firmware AL10BC00B201 with EMUI 5.1, but too fail...
[SPOILER="Enable downgrade"]SigmaKey 2.29.20b1 HiSi: Enable downgrade
Connecting....
Android Adapter PCUI (COM183), Provider: Huawei Incorporated, Driver ver.: 2.0.6.725, Date: 28.12.2015, USB\Vid_12D1&Subclass_13&Prot_22
Firmware: System 8.0.0.046(0EUY), Date: Wed Jul 18 11:48:52 CST 2018, Provider: all/cn
Boot Version: System 8.0.0.046(0EUY)_BOOT, FastBoot Version: Chipset-dallas8.0.1.001(01AF)_FASTBOOT
Recovery Version: (unknow), System Version: System 8.0.0.046(0EUY)
Removing firmware protection...This Android security patch level is not supported.
Please wait for future updates.[/SPOILER]

Is it possible to lower the firmware version?