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Power off the router, insert the "foreign" SIM card, and power it back on.
If you run into problems, don't panic. Here are solutions to some common issues: Unlock Huawei B311-221
The is the first piece of software that runs when the router powers on. It decides whether to load the official firmware or to allow custom firmware. In recent years, Huawei stopped providing official bootloader unlock codes for many devices, including the B311‑221. Power off the router, insert the "foreign" SIM
Avoid expensive international roaming fees by using local prepaid SIM cards abroad. It decides whether to load the official firmware
Ensure the SIM card is active and correctly inserted. Sometimes a factory reset (using the pinhole button on the back) is required after unlocking to refresh network settings. If you'd like to move forward, tell me: Which carrier is the device currently locked to? Do you have the IMEI number ready?
Connect your computer to the router via Ethernet (more reliable than Wi-Fi for this step).
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