First Download Universal MasterCode.exe by Clicking Here
Then Open it and Enter your 15 Digit IMEI number as shown in the below screen and generate your Unlock Code and Flash Code.
Example: From IMEI number (353474024585481), You can generate unlock code (60684032) and flash code (58346543)
*. After that Universal Master Code Generator Will give you Unlock code and Flash Code
*. Now Plug-in your data card with your laptop or desktop With Other than Default Aircel Sim
*. Then install Dashboard provided in Data card And Open it
*. Now It will ask For Unlock Code so You just have to enter the Unlock code their and you Data card is unlocked
*. So now you can enjoy high speed internet with any other 2G network also.
*. Create new profile for you network provider ( Using APN ), try to connect to the internet now. Now Enjoy Any SIM Facility using Huawei E1750C