Because the bootloader is locked, your only hope is third-party "unlock services." These exploit leaked engineering firmware or paid tokens.
. Since then, there is no official, free way to obtain the required 16-digit unlock code How to Unlock Bootloader in HUAWEI Honor 8C phone
Type adb reboot bootloader and press Enter. Your phone will restart into Fastboot Mode (usually a white screen with a robot). Because the bootloader is locked, your only hope