If the code doesn't work, here is why that usually happens:
Once the code is accepted, the device will permanently accept any SIM card. Huawei Unlock Code Calculator With IMEI ... - Facebook huawei v4 and v5 unlock code calculator download fixed
Instead of downloading a risky “fixed” calculator, use : If the code doesn't work, here is why
Used for 4G devices, these codes are also 8 digits but require complex MD5 hashing against the IMEI. If the code doesn't work