I can't make a phantom out of it no matter how much I squint. If it took 5 to 10 minutes to cross the sky then it is also not likely a phantom. Also the Phantom is fairly loud so if you were 50 or 100 m away from it then you would have definitely heard it. I go along with others that it seems...
I had a very similar problem only it stopped multiple times at some other percentage. I finally got a new cable and it worked! If that doesn't work, load DJI Assistant 2 onto another computer and try it from there.
I have a broken gimbal on my Phantom, so everything is in perfect order except for a plastic part on the gimbal and the ribbon cable, so yes I have extra parts!. Mine is the P4 Advanced. Is that the same board?