Use a high-quality or original Huawei USB cable.
For 99% of readers, the HCU Client method is the only realistic option. Here is the : huawei nova 5t unlock bootloader new
: Unlocking the bootloader performs a factory reset , wiping all personal data from the device. Use a high-quality or original Huawei USB cable
Go to Settings -> Developer Options -> Toggle "OEM Unlocking" and "USB Debugging". huawei nova 5t unlock bootloader new