: You must physically remove the back cover to access a "testpoint" on the motherboard. on a PC with HUAWEI USB COM drivers.
This is a popular open-source method, but it is highly technical and requires opening your phone. Requirements How to Unlock Bootloader in HUAWEI Nova 5T phone
Unlocking the bootloader on a HUAWEI Nova 5T is extremely difficult because HUAWEI officially stopped providing bootloader unlock codes : You must physically remove the back cover