Instructions to set the audio configuration automatically
Step-by-step guide
1. Access the Menu - Tap the button as three dots or when this is absent, check for another icon to access the menu, or from the image, try instead pressing and holding either the back arrow, two rectangles icon, or the square shape, where these sometimes serve as menu shortcuts when the button is not available in view.
2. Select Settings
3. Start AutoConfig
4. Then the application will try to send commands to the reader with different audio baud rates. You will see the percentage of progress going up.
5. Once the proper baud rate is found and the reader receives the handshaking message, it will return an acknowledged response to the application. Then the reader will be able to communicate with your phone. For some phones when it shows success after auto-config, you need to re-plugin the reader to send commands and receive responses.
Or if the phone hardware does not meet the required audio jack spec, it will fail when reaches 100% trial.
ps. Make sure to maximize the volume.