inCarDoc Download link: inCarDoc - OBD2 ELM327 Scanner - Google Play 

Step1:
Press the vLinker FS Bluetooth button, then open your phone's Bluetooth settings, search for and tap "vLinker FS XXXXX".





Step2:
A request pairing prompt will be generated when pairing, click on "Pair".





Step3:
Successfully paired to the Bluetooth device "vLinker FS XXXXX".





Step4:
Click on "Settings".





Step5:
Click on "Connection".





Step6:
Click on "Connection mode".





Step7:
Select "Bluetooth" as the connection method. 





Step8:
Click on "BT connection"





Step9:
Select the paired Bluetooth device "vLinker FS XXXXX".





Step10:
Return to the home page when the settings are complete.





Step11:
Click on "Connect <BT "vLinker FS XXXXX">".





Step12:
Connected successfully.