Name: Huawei MF821 Driver
Author: Huawei

Question 1

Installer fails or rolls back?

Accepted Answer

Run the Huawei MF821 driver package as administrator, temporarily disable antivirus, and disconnect the USB modem until setup asks for it.

Question 2

Device not detected?

Accepted Answer

Try a different USB 2.0 port directly on the PC, check Device Manager for unknown devices or serial ports, and reinstall the MF821 driver before reconnecting the stick.

Question 3

Version conflicts?

Accepted Answer

Uninstall older Huawei Mobile Broadband/dashboard drivers and related modem entries, reboot, then install the MF821-matched driver package only.