If you are following an article to unlock a specific device like a MiFi router:
The "New Algo" versions were developed to prevent unauthorized network unlocking and bootloader access on newer 4G modems, routers, and mobile devices. Algo V4 (2015):
Huawei devices grant exactly to enter the correct network unlock code.
The tool requests matching codes from factory security logs.
The International Mobile Equipment Identity (IMEI) serves as the primary unique identifier for the hardware.