Solved: PCMflash "Unable to Use Selected Interface" Issue
Problem: The V1.24 PCMtuner is unable to recognizll are unactivated. The PCMflash prompts: " Unable to use selected interface(J2534: Scanmatik - SM2 USB). Check if it's connected and not in use by other applications."
Solution
1. Close all PCMflash software;
2. Re-insert dongle to recognize;
3. Restart PCMflash software.
NOTE
Please ask your agency to activate account firstly if haven't.
Please DO NOT open multiple PCMflash software meanwhile.
Thanks to obd2shop.co.uk engineer, problem was solved.