Pro Tip: If your USB modem is detected as a CD drive (e.g., “MTN CD-ROM”), do not use AutoRun. Copy the setup files first—AutoRun often fails on modern Windows due to security policies.
Once you have downloaded the MTN modem setup file (whether official or generic), follow these precise steps: download+mtn+modem+setup+for+pc+install
MsiExec.exe /XMTN-PRODUCT-CODE /quiet
pnputil /delete-driver oem0.inf (find correct oem# via pnputil /enum-drivers) Pro Tip: If your USB modem is detected as a CD drive (e
If your modem is older or the internal storage is corrupted, you may need to download the specific driver software manually. Once you have downloaded the MTN modem setup
.exe file and follow the prompts.This is the most common method for USB sticks (Huawei, ZTE).
| Symptom | Root Cause | Fix |
|---------|------------|-----|
| Modem detected as CD drive only | USB modeswitch failed | Install usb_modeswitch manually or use Eject in Explorer then reinsert. |
| Dashboard says “No Device” | Another modem driver (e.g., QC Serial) holds the COM port | Disable “Qualcomm HS-USB Diagnostics 9091” in Device Manager. |
| Connection drops after 10 min | Idle timeout + Windows power management | Device Manager → Modem → Properties → Power Management → Uncheck “Allow computer to turn off”. |
| Error 628 / 691 | Wrong APN or expired SIM | Re-enter APN; test SIM in phone first. |
| Error 797 | Modem not found at dial time | Reinstall using devcon.exe remove + rescan. |