Unfortunately, this is an ongoing problem for us. We see many Kamoer products that are produced for other countries that will not work here in the US or other territories outside of their designated region. Usually, the pumps will not connect properly to the app or at all and are resold after the user realizes it doesn't work properly. Although you always take a risk when you purchase anything used, I have not heard of the issue you are having. Kamoer can possibly confirm the pump's origins with the QR code off the back of the pump or what could be causing the issue. My guess is that there is an issue with the control board and would suggest that you try to return the item to the original seller if possible.