Name: Sierra Wireless AirCard USB 301 Driver
Author: Sierra Wireless

Question 1

Installer fails or rolls back?

Accepted Answer

Run the Sierra Wireless installer as administrator and try compatibility mode for an older Windows version. If it still fails, open Device Manager, right-click the AirCard USB 301 entry, choose Update driver, and point it to the extracted INF files.

Question 2

Device not detected?

Accepted Answer

Try a different USB port, reseat the modem, and check Device Manager for an Unknown device or CD-ROM-mode enumeration. Install the driver before opening Sierra Wireless Watcher.

Question 3

Driver/version conflicts?

Accepted Answer

Uninstall older Sierra Wireless drivers and Watcher utilities, remove hidden modem entries in Device Manager, reboot, then install only the matching AirCard USB 301 driver package.