Please help!!! I just bought my brand new fc40, I think it flew great at my first attempt about 3 ft off the ground. I then visited the DJI website and found some software upgrades, downloaded then tried to "up grade" my FC40.... Now everytime I plug in the battery, the FC40 flashes a few greens, reds then rapidly flashing yellow and won't stop. I did IMU Advance and Basic calibrations over and over but still do not help. Please advise. I apologize if this has been posted before, but I could not find the answers. Thank you very much.