Remove the SIM card and connect the modem to your PC via USB.
If v5.7.7 doesn't work for your specific model, consider these options: huawei modem unlocker v5.7.7
Offers options to unlock for a single session or permanently. Remove the SIM card and connect the modem to your PC via USB
For older "Algo v1" or "Algo v2" modems, you can generate a code using just your IMEI number. huawei modem unlocker v5.7.7
Can often reset the "Unlock Code" counter if you have entered the wrong code too many times. Supported Devices
Unlocking your device via third-party tools will void any remaining manufacturer warranty. Alternatives to Software Tools