The honest answer for most users is . The official, safe method is dead. The remaining unofficial methods require technical skill, financial cost, physical risk to the device, and acceptance of serious security compromises. Unless you are an experienced Android developer who specifically needs a Kirin 960 device for low-level testing, the risks outweigh the benefits.
Use the PotatoNV tool to generate a new 16-character unlock code and write it to the device. How to Unlock Bootloader in HONOR 9 phone