If you tried to use a V3 calculator on a V5 modem, you'd get an 8-digit code that did absolutely nothing except waste your 3 allowed attempts.

Here is the current status:

🔓 Huawei V4 & V5 Unlock Code Calculator: Latest Download & Guide

While many "free" tools online can be risky, there are reliable platforms and apps available: Mobile App: Codes Calculator for Huawei on Google Play

In the early days, the "V1" and "V2" algorithms were easily cracked. However, as security tightened, Huawei introduced more complex hashing methods: