In PC Manager, go to Optimization > Drivers and click CHECK .

Once you have downloaded the driver package or the PC Manager, follow these steps:

Huawei also offers a dedicated Driver download tool designed to simplify the process for Windows users. How to Install the Drivers on Windows

If prompted, restart your computer to apply the changes and ensure the virtual modem port is recognized. Alternative: Setup Without Drivers

Use the original USB cable to plug your E5576 into your computer's USB port.

Interestingly, you don't always need drivers to use the Huawei E5576. HUAWEI HiLink