Name: Motorola USB Modem Driver
Author: Motorola

Question 1

Install fails (Code 10/28 or unsigned driver)?

Accepted Answer

Run the Motorola installer as administrator and use a Motorola-signed package. In Device Manager, remove any failed “Motorola USB Modem” entry, reboot, then reinstall before plugging in the modem.

Question 2

Device not detected / no COM port?

Accepted Answer

Try a different USB data cable and a rear direct USB port, not a hub. Check Device Manager under “Modems” and “Ports (COM & LPT)”; uninstall unknown devices, rescan, and confirm the modem is not in charge-only mode.

Question 3

Version conflicts (Code 31/39)?

Accepted Answer

Uninstall existing Motorola modem drivers and select “Delete driver software” in Device Manager. Reboot, install the latest Motorola package, then reconnect the modem and verify the assigned COM port.