I find this video confusing. The lady presses the button while keeping the drone upside down. Followed by a shot with the drone "upside up". Then she says, when a specific light pattern (purple, white and green) appears, flip the drone upside down. But she turns it upside-up and places it on the floor so it can take off. Which makes sense because it is impossible to flip the drone upside down and place it on the floor to take off. So what is the real procedure to calibrate the CoDrone?