NOTE: Just enable Bluetooth settings on your iOS device. DO NOT Need to connect Bluetooth Name on iOS device. Then connect the Bluetooth device name in the OBD app setting.
Step1: Open the app and click on the Settings button in the bottom left corner.
Step2: Click on "Interface".
Step3: Select "Bluetooth LE 4.0 & Carista".
Step4: After selecting the correct Interface, return to the home page.