: Supports writing original UPDATE.APP files to lower firmware versions .

The (also called VCOM mode) is the low-level diagnostic mode required for most Kirin flashing operations. Windows will not recognize the device in this mode without the correct drivers.

: The software test point method requires a security patch of January 2021 or older. If you are on a newer patch, you must use the hardware test point method instead.

: Open a command prompt in your ADB/Fastboot folder and run:

Because Huawei does not provide an official, universally accessible service tool for consumers, developers and repair technicians rely on a mix of free utilities and professional service dongles. 1. IDT (Image Deployment Tool)

For a bootloader unlock using only free tools, follow the updated XDA guide authored by Kethily Daniel, NDX, and others.

Which do you have access to? (e.g., free tools, premium dongles)