On the watch, swipe up and tap Settings
Tap General
Tap Reset
Tap Reset again to confirm
Enter your PIN if prompted
Wait for the watch to restart and erase data
To factory reset from the Galaxy Wearable app, open the app on your phone
Tap Watch settings
Tap General
Tap Reset
Tap Reset again to confirm
To force restart first, press and hold the Home and Back buttons together until the watch restarts
If the watch is unresponsive, charge it and try the reset again