Note: Newer Huawei devices with Qualcomm chips (like the Mate 50 series with Snapdragon 8+ Gen 1) may still work with these drivers, but they are not Kirin-based.
For hard-bricked devices (black screen, no vibration, no fastboot), you need Test Point (TP) mode. This shorts two specific pins on the motherboard to force the CPU into "Download Mode."
For Windows 8/10/11, you may need to temporarily disable driver signature enforcement, especially for older drivers.