I had to return my first P3 Professional before I'd even flown it because it had all sorts of problems. The shop replaced it without any argument. But now I'm having problems with the replacement, and this one hasn't even flown yet either. The first thing I did out of the box was to install the latest firmware, using micro SD card for the craft and Internet for the controller. However, when I did a check with the craft connected (indoors, as the weather's so bad) I got 'MC data error' and 'data storage error'. It told me to turn the craft off then on again, but the error's still there. I also noticed that when I tried to calibrate the compass, although the instructions appeared in the Go App, and the craft's image turned from horizontal to vertical after I had done the 360 degree horizontal rotation, when I went back to the calibration button, it still said 'calibrate'. I'd like to know if anyone here thinks there's something actually faulty about the craft, in which case, I think it would be safer to ask for another replacement. I don't want to start tinkering with it if replacing it is what I should do. Any advice would be most welcome - this is my first 'grown-up' quadcopter, and I hardly have the faintest idea of what I'm doing. Thanks.