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+I found a way to solve the problem that the digital paper app is not able to find dpt when pairing.
+
+1. Open device manager and check if there's any conflict ports in ports(COM&LPT) section. (For example, maybe there're two devices that were assigned COM3)
+2. And, if there's conflict, try to figure out which one is dpt. (You can find when the device was plugged in from properties--> events)
+3. Then you should change its port number(in properties -> port settings -> advanced) to any port that is not in use.
+4. Save, and unplug the device.
+5. Open digital paper app and try to pair again.
+
+Some background knowledge: https://github.com/janten/dpt-rp1-py/blob/master/docs/linux-ethernet-over-usb.md