You can hard reset the Oppo Watch OW19W6AP to wipe all data and reset it to factory settings. If you are installing custom firmware, you should always format the device beforehand.
How to Hard Reset Oppo Watch OW19W6AP
You can hard reset the Oppo Watch OW19W6AP using the hardware buttons.
1. With the Oppo Watch turned on, press and hold the Lower button for two seconds.
2. Press the Upper button.
3. Tap Settings from the menu.
4. Tap System.
5. Tap Reset.
6. Tap the confirmation checkmark.
In conclusion, that is how to hard reset the Oppo Watch OW19W6AP.