The Huawei B311-221 is a popular 4G LTE router, but its firmware is often locked to specific network providers (like Optus, Telkom, or Zain). Unlocking it allows you to use any SIM card from any carrier.
Access the web interface at http://192.168.8.1 and enter the code when prompted on the Simlock page. huawei router b311221 unlock firmware free
Disclaimer: This article is for educational purposes. Modifying firmware may violate your carrier’s terms of service. The author is not responsible for damaged devices. The Huawei B311-221 is a popular 4G LTE