If software mode fails (common on newer EMUI versions like 8.0/9.1), you need to short two pins on the motherboard.
If you successfully unlocked, consider posting your experience on the XDA forum to help the next person. Remember: Patience is the only tool that never fails. How to Unlock Bootloader in HUAWEI Honor 9 Lite...
: You must remove the back cover to access the "test points" on the motherboard Trigger VCOM Mode If software mode fails (common on newer EMUI versions like 8