Firstly, you need to give the Stemoscope App access to your phone camera to read the QR code. Secondly, you may try different light environment and shoot angles. Thirdly, you may unscrew the diaphragm cover and put the diaphragm on a white background such as a white paper to shoot the QR code. If you still the App still can’t scan the QR code, don’t worry and you can take a clear picture of the QR code and email us. We will generate an electronic version for you.