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If your Apple Watch gets slow or doesn't work as it usually does, it may help to restore the factory default settings. All settings and configurations you've made on your Apple Watch are deleted.
1. Find "Reset"
Press the Digital Crown.
Press the settings icon.
2. Restore factory default settings
Press Erase All Content and Settings.
Press Erase All. Wait a moment while the factory default settings are restored. Follow the instructions on the screen to set up your Apple Watch and prepare it for use.