2. Put the phone flat on a stable horizontal surface and wait for the compass to calibrate automatically.
3. After the automatic calibration is completed, turn the phone into a figure of eight, that is, turn it 45 degrees to the left, then 45 degrees down, 45 degrees to the right, and finally 45 degrees up.
After the 4.8-shaped flip is completed, put the phone back on a stable horizontal surface and wait for the compass to be recalibrated.