Just bought a new Caddx Vista unit, and went to activate it in DJI Assistant, but when I plug it into USB, there is no response whatsoever. No sound of serial port connection, no serial ports open. Tried server different usb cables without luck. Not even any lights. Plugged it into my flight Controller (5V, G, TX and RX), and I get a red light, so it's not a dead unit. I read where I need to activate it first, and upgrade the FW. Any thoughts

Updating my post with success details. Two changes that allowed me to successfully activate. 1. Provided higher (9V) voltage to unit, and 2. waited longer for the DJI Assistant to connect (took 20-30 seconds).