I recently purchased a mobile charger but i have an issue. There are times when i connect it to the device it detects it as a USB device and doesnt charge, so i have to try multiple times until it connects and it charges. Also intermittently it will detect it as a USB device and charger. When in USB mode i am unable to use the FM transmitter.

My question is HOW TO use terminal to disconnect the so called USB device so i can then use the FM transmitter.