Introduced around the era of the Kirin 960/970 chipsets, this version moved away from simple mathematical offsets to more complex cryptographic hashing.
There is no single "official paper" for the Huawei V4 and V5 unlock code algorithm, as these are proprietary security mechanisms. However, technical communities have reverse-engineered the logic through firmware analysis, notably from router updates. Huawei Unlock Code Algorithms huawei v4 and v5 unlock code calculator by imei