A: In most regions, yes. However, you can re-lock the router by flashing original carrier firmware (not recommended unless returning for repair).

Huawei uses a proprietary algorithm based on the IMEI and a master key or seed. Over the years, security researchers have reverse-engineered older Huawei models (including the B312-939’s chipset, typically the HiSilicon Balong V7R2 or V9R). The calculator performs mathematical operations (modular arithmetic with constants like 0x2000000 or 0x400000 ) to derive the NCK code.

: They rarely work for the B312-939 and often compromise your computer's security. Check the Algorithm

For years, unlocking older Huawei modems was trivial. You could download a tool like , HC Calculator , or Bobby Unlocker , punch in your IMEI, and instantly get a free code.

Have you successfully unlocked your Huawei B312-939? Share your experience and which calculator worked in the comments below.

For advanced users, a Python script called huawei_unlock.py is available on GitHub. Run it with your IMEI:

Write down the . Do not share it publicly — scammers can clone it.