Perform a soft, factory, and alternate master reset of the device.
WATCH AND LEARN
INSTRUCTIONS & INFO
To reset your watch’s settings to their factory default values and delete all of your data, from the watch face, swipe down from the top of the screen. Note: Your watch connects to one mobile device at a time. A factory reset erases all data from your watch's memory. After completion, it is ready to connect to another mobile device.
Swipe right to left four times then tap Settings.
Scroll down, then tap Unpair with phone.
To Unpair and factory reset your watch, tap the Check mark icon. Note: Unpairing will factory reset your watch settings and delete all user data.