| Error Message | Cause | Solution | | :--- | :--- | :--- | | | Bootloader locked by carrier | You must use the "Force Unsigned" option in Balong Flash Tool. Check the box "Bypass signature check." | | Router stuck with red light | Wrong firmware board ID | Perform an emergency recovery: Download the original carrier firmware and reflash via the same method. | | Cannot see COM port | Windows driver signature enforcement | Disable driver signature enforcement in Windows (Shift + Restart > Troubleshoot > Startup Settings). | | SIM card not detected after unlock | IMEI mismatch | Generic firmware sometimes resets the radio. Go to Settings > System > Restore Factory Defaults (full reset). | | Web interface is Chinese | Downloaded Chinese generic firmware | Re-flash with a European/Russian generic firmware (e.g., 21.313.01.00.00). Look for "Global" version. |
: Power off the router and insert a SIM card from a different network provider Enter the Code huawei router b311221 unlock firmware
Unlocking the firmware of the Huawei Router B311-221 offers several benefits, including: | Error Message | Cause | Solution |