I can list the for the tools mentioned above. HMUC-Huawei Modem Unlock Codes - Apps on Google Play
The is designed for older Huawei devices running Android 4.4 (KitKat) through Android 6.0 (Marshmallow). It uses a specific algorithm to generate a 16-digit numeric code based on your device's IMEI number or serial number. This code is traditionally used to unlock the manufacturer’s bootloader, but hackers adapted it to bypass early versions of Google FRP (Factory Reset Protection). Download Huawei V4 And V5 Unlock Code Calculator
The science is relatively simple: