Follow the steps to unlock the Huawei modem, which is not asking for an unlock code
1. After flashing the airtel E173CS-1 or any other modem, download the Huawei Modem Code Writer Tool from the link provided at the end of the article.
2. Extract the zip file and run the Huawei Modem Code Writer.exe.
3. Now plug your flashed Huawei modem in your computer.
4. Now click on the “Please Select Com Port” button, and it will open a small window.
5. Click on the Detect button and select the port.
6. After selecting the Com port, click on the Accept button.
7. Now click on the Unlock Modem button.
8. Now, it will open a new window asking for an unlock code.
9. Here, provide the Unlock Code (8 digits) you have already, and after that, click on the OK button.
Now you have an unlocked Huawei 3G modem in your hand. Enjoy!!!