New to the drone world here, just purchased a slightly used Phantom 1 to start out with. Once I power on the remote properly, I plug in the drone battery. As soon as I do that I get a constant beeping and red flash from the drone. I try to complete the calibration process, and get the yellow light and green light during that, but once I complete the finall rotation is goes back to red and continues to beep. After researching this I didn't find very many with the same issue. Any ideas where I should start out first??? No physical signs of a crash on the unit, and I am plugging a fully charged battery in during startup. Any help is appreciated!