Scroll down and tap Unpair device or Factory reset (wording may vary by app version).
The watch will turn off and automatically restart with the Xiaomi/Mi logo. How to Hard Reset XIAOMI Watch S1
Q: How long does a hard reset take? A: The hard reset process typically takes a few minutes to complete. Scroll down and tap Unpair device or Factory
: Press the Upper button again to access your apps. How to Hard Reset XIAOMI Watch S1