Only download from the official developer’s website (if verifiable) or a trusted repository like APKMirror (which checks signatures). Scan the APK with Virustotal before installing.
| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | | Phone is not connected to the internet. | Check Wi-Fi or Mobile Data. | | "Connection Timeout" | IP address or Port is incorrect. | Verify DVR network settings. Ensure port forwarding is active. | | "Username/Password Error" | Incorrect credentials. | Reset DVR password via the monitor interface. | | "Video Format Not Supported" | Codec mismatch. | Change the DVR’s encode setting from H.265 to H.264 (older phones struggle with H.265). | | "App Crashes on Open" | Android version too new (e.g., Android 13/14). | The APK is too old. Enable "Compatibility Mode" in Android settings, or upgrade your DVR firmware. | fvcardvr apk