There is a famous tool called that can unlock bootloaders on older Kirin devices (Kirin 655, 658, 659, 960 – found in devices like Huawei P9 Lite, Nova 2i, etc.). This does NOT work on the Kirin 980. The Nova 5T’s chipset uses different security architecture (Trusted Execution Environment + Secure Boot chain 2.0).
A: You will get an error: "FAILED (remote: 'Please unlock device firstly.')" or "Command not allowed." huawei nova 5t unlock bootloader
This is the first and most important reality check: There is a famous tool called that can