If you are experiencing issues connecting your eufy C210 Smart Lock to a 2.4GHz WiFi network during the setup process, please try the following troubleshooting steps to verify if the issue can be resolved.

Note: eufy C210 Smart Lock connects only to a 2.4GHz WiFi network and not a 5GHz WiFi network. Additionally, please make sure the 2.4GHz WiFi network SSID is not hidden and the security protocol is set to either WPA or WPA2.

• WiFi signal - Verify the location where the C210 Smart Lock is being installed has a strong and stable WiFi signal.
• Incorrect WiFi password - Please make sure you have entered the correct WiFi password to connect the C210 Smart Lock to your 2.4GHz WiFi network.
• eufy Security app permission - Confirm you have granted the eufy Security app permission to access your phone. Please also try setting up the C210 Smart Lock by using another phone or tablet, if possible.
• Reset the device - Please try resetting your C210 Smart Lock to its factory settings by pressing the SYNC button on the device five times in a row, then wait for 30 seconds before pressing and holding the SYNC button to activate the Smart Lock to begin the setup process again.