Last thursday i received a used phantom 2 vision with t-motors. I am new to this. It flew fine. But i decided to upgrade the phantom firmware. I then recalibrated the compass and flew it like two times. When i went to fly it today the two back light went solid red. I connected the phantom to the assistant software and it said something about abnormal compass.. I have reset the flight controller and also i have done the magnet thing over the compass and also the imu calibration(basic and advanced). Please help