I have done all the updates from 400 to 600 and never had a problem. I won't say this will cure all problems nor am i telling you what to do, just sharing my procedure.
1. Update mavic then controller.
2. recalibrate rc.
3. After letting mavic cool down (off) i do the IMU recal, preferably within 2 minutes then switch off.
4. Restart, calibrate gimbal inc manually tweaking the horizon using 2 perfectly level work tops parallel to each other.
5. Redo my preferred settings including resetting cam ntsc to pal and back.
6. Calibrate compass.
Hope that may help.
1. Update mavic then controller.
2. recalibrate rc.
3. After letting mavic cool down (off) i do the IMU recal, preferably within 2 minutes then switch off.
4. Restart, calibrate gimbal inc manually tweaking the horizon using 2 perfectly level work tops parallel to each other.
5. Redo my preferred settings including resetting cam ntsc to pal and back.
6. Calibrate compass.
Hope that may help.