Hi Gang I feel like a bit of a dufus but I wanted to share this with you. Returned from a trip out West so I wanted to do a complete reset and recalibration. I've been getting drift with yaw so degaussed the compass hoping this would help (it didn't). Went outside and couldn't get anything except slow flashing yellow. Couldn't get it into compass calibration mode - nothing. No green, no red, just slow yellow. I checked the DJI docs and scoured this forum. Nothing. Found that the compass cable was loose! Reseated it and all was well! (well almost - still drifting with yaw) Doh!