Warning: To use this feature on your HONOR MagicWatch 2 you need to update the firmware on your watch to version 1.0.6.32 or later.
- First, press the Upper button to wake up the screen on your HONOR MagicWatch 2.
- Now press the Upper button again to open the App menu.
- After that scroll down and tap on the SpO2 icon.
- After the countdown is complete the measurement will start.
- Wait until you see the results.
- Spectacular work
Source : hardreset.info