That's exactly a 10% increase over the prior price of $4650. Glad I got mine when I did as well, as a bird in the hand from Adorama, no risk, and a DJI warranty, not that it will ever be needed, which is why I would have been OK with your deal, too.
I am on the 0300 firmware and have compass calibration under ... settings-safety-sensors just above IMU calibration. It shows Compass normal and calibrate on far right. I did it just to make sure it works.
Yours is missing?