: Use a standard USB 2.0 cable to connect the printer directly to the PC.

| Issue | Solution | |--------|----------| | | Windows 10 lacks native support. Install the TM Virtual Port Driver (v5.07 or newer). | | UB-U03II appears as “Unknown USB Device” | Unplug the USB cable, restart the PC, then reinstall the Virtual Port Driver before reconnecting. | | Printing works but no serial communication | Open Device Manager, note the COM port number assigned to UB-U03II, then configure your POS software to use that COM port. | | Wi-Fi mode not detected | Use Epson’s TMNet WinConfig tool (separate download) to set the UB-U03II’s IP address and switch to Infrastructure mode. |

It allows Windows 10 to recognize the TM printer through the USB card interface. 2. Epson TM Virtual Port Driver