When searching for you need all three components to be the latest versions. The "top" download is typically found on the official JDiag website or through the device’s built-in OTA (Over-The-Air) updater.
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This is usually due to corrupt cached data. Go to Android Settings > Apps > JDiag Diagnostic > Clear Cache (do not clear data unless necessary). If that fails, uninstall the app and reinstall using the manual APK download method. When searching for you need all three components