: If using USB, check Windows Device Manager under "Ports (COM & LPT)" to see which COM port has been assigned to the device. Middleware Requirements
If your reader is integrated into a specific laptop (like a Dell Latitude), use the Dell Support site to find the "QProx" or "Ezprox" reader driver specific to that model. Ezprox contactless reader driver download
| Problem | Likely Cause | Solution | |---------|--------------|----------| | “Driver not found” in Device Manager | Windows blocked unsigned driver | Reboot with signature enforcement disabled, or use Windows Update. | | Reader lights up but no card read | Wrong driver or conflicting software | Uninstall any old smart card drivers (e.g., from Gemalto, OmniKey). | | Blue screen (BSOD) after installation | Corrupt driver or IRQ conflict | Boot into Safe Mode, roll back driver, download fresh copy from HID. | | Works on one PC but not another | Missing USB chipset drivers | Update motherboard USB drivers from Dell/Lenovo/HP support. | | Card number shows as gibberish | Incorrect baud rate or parity | Use HID’s “Reader Configuration Tool” to reset to factory defaults. | : If using USB, check Windows Device Manager