compass calbration

Hello there guys. i'm having a bitter issue here. Drone okay, have been using the i2 for 5 years now and lately the compass can't be calibrate...always giving me the error. tried everything, even replacing the compass for new ones a few times... No firmware to update and the mesure of the...

Anyone having this issue? After multiple attempts in several different locations the compass will not calibrate. Seems to go through the horizontal calibration ok (green lights), but pointing it down results in the error. BTW I was having this issue before the most recent firmware upgrade...