The watch will reboot into a new menu with an Android robot lying down. Now, press and hold the Top Right button, then press and release the Bottom Right button once while still holding the Top button. Finally, release the Top button.
Scroll to “Yes — delete all user data” and press Top Right to confirm. How to Hard Reset CASIO Pro Trek WSD-F20
Scroll down and select System .
Release both buttons. Use the Bottom Right button to scroll down through options. Stop on “Recovery Mode” . The watch will reboot into a new menu
Scroll and tap Settings (the gear icon). How to Hard Reset CASIO Pro Trek WSD-F20