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The Huawei Toolbox was born as a "swiss-army knife" for these power users. While earlier versions were buggy, version 1.0.7 became the "Goldilocks" release. It was stable, supported a wide array of Kirin processors, and—most importantly—it was distributed for free. The Midnight Operation download huawei toolbox v1.0.7 free
Even with stable software, issues can arise. Here is how to fix them: Fastboot Operations: Easily check device info
A reliable USB data cable (preferably original Huawei). Step-by-Step Guide to Download Huawei Toolbox v1.0.7 Free unlock bootloaders (where supported)