An unlocked bootloader is required, and the factory unlock is enabled.
1. Install TWRP
2. Install SuperRoot_noverity_nocrypt.zip through TWRP
3. Boot the system.
4. You need to install the APK from PlayStore afterwards https://play.google.com/store/apps/d....phh.superuser
Now you have root access and full access to the system partitions.
If an error "Error 1" is output with the firmware in TWRP. It is necessary to replace BOOT.img, on BOOT.img, from the firmware that you installed before obtaining root access.
fastboot flash boot boot.img
Additional materials that can help with troubleshooting. (Here you will find firmware from Huawei.)
The firmware for VTR
The firmware for VKY