Between 2020 and 2022, Huawei released security patches that broke the original v3 calculator. Users began reporting issues:
ket-c/huaweiv3calculator: Calculate the unlock code ... - GitHub huawei unlock code calculator v3 fix download
The "V3" or "v201" algorithm is the third major iteration of Huawei's security code logic. While earlier versions (V1 and V2) covered legacy devices, the V3 fix is specifically targeted at: 3G Modems: Generally has a 100% success rate for older 3G hardware. 4G Devices: Between 2020 and 2022, Huawei released security patches
First, a distinction. There are two types of unlock codes: Between 2020 and 2022