Hi, Not sure where to begin....Got a used p2v+ used. told it was working...it wasn't what was represented. first issue: cannot calibrate rc transmitter - I turn on p2v+, wait, red led for bind flashes, turn on transmitter, red led goes off, then nothing, move sticks down to start, nothing.... Loaded phantom2 assiant program and windows usb driver..connected micro usb to transmitter -windows pc beeps, usb connected...launch program...nothing...transmitter not detected...tried on both win 7 & win 10 pc? Thought it was the rc transmitter not binding...got another...same thing??? When I connect the p2v+ via usb to pc and launch DJI Phantom 2 Vision Assistant_3.8...sees p2v+ fine...I can see battery voltages, reset imu, reflash firmware 3.8....but cannot see or calibrate rc transmitter??? *note I have 2 vision cameras, not connected so not sure if that matters? What next??? I am almost ready to purchase replacement p2v+ and try that??? Any ideas?