I just bought the FC40. I got it set up, powered on the remote, then connected the battery. The lights are not cycling through calibration as indicated in the manual. Instead, they cycle through "red, red, red, green". I left if for a few minutes with no change. I tried switching to atti mode but am not getting any response from the unit. What am I missing here? Note that I am attempting a first flight in an apartment in a big city; is that the issue? Do I need to be outdoors to initialize? I was hoping to test it out indoors before taking into the field.