Early Huawei phones (predominantly those running older HiSilicon Kirin 620, 650, 920, and 930 processors or Qualcomm Snapdragon variants) utilized a relatively straightforward mathematical relationship between the IMEI and the unlock code.
Many downloadable .exe files claiming to be "16-digit Huawei unlock cracks" are actually trojans, malware, or adware designed to compromise your computer. Modern Alternatives for Unlocking Huawei Devices
These programs operate by iterating through numbers sequentially—starting from 0000000000000000 up to 9999999999999999 —and testing each code via Fastboot commands. Some sophisticated tools implement features like checkpoint saving, which stores the last attempted code so the process can resume after interruptions. The huawei_bootloader_unlocker C program, for instance, uses signal handling to capture interrupt signals and automatically save progress to a lastcode file.