I am using USB 3G modem with my RPi 3 modem B+. Modem gets freeze sometimes so i need to reset it. I was using https://askubuntu.com/questions/645/how-do-you-reset-a-usb-device-from-the-command-line but it can't reset my modem. As i know Rpi3 uses AP2552 for USB power. AP2552 has a enable pin, which pin of BCM controls that enable? How i control that pin?