Unlocking the Huawei B311s-220 router via firmware update (or NCK code) is a widely practiced method to make the device compatible with any network provider. It is generally regarded as a stable and permanent solution if done correctly, turning a carrier-locked modem into a generic, flexible, and often more feature-rich router
This removes carrier-specific restrictions but carries the risk of "bricking" the device if the wrong file is used. huawei b311s220 unlock firmware upd