Hi there! I see you're having trouble getting your JYouPro app to connect via Bluetooth after it worked once. Let's work through this together to get things back on track.

First, can you tell me:
- Which JYouPro device model are you using (watch, bracelet, etc.)?
- Did you try turning Bluetooth off and back on, or restarting your phone and the device?
- Are you seeing any specific error messages from the app when attempting to connect?
- Is your device fully charged?

Meanwhile, here’s a solid step-by-step plan you can follow that often resolves this kind of issue on Android 10 with WebKit browser environment:

1. Restart Devices: Power off and back on both your phone and your JYouPro device. This resets temporary glitches.

2. Check Bluetooth Settings:
- Go to your phone’s Bluetooth settings.
- Look for your JYouPro device in the paired list.
- If already listed, remove/unpair it.

3. Clear Bluetooth Cache:
- Open Settings > Apps > Show system apps.
- Find “Bluetooth” or “Bluetooth Share.”
- Tap Storage, then “Clear Cache” (and “Clear Data” if needed).

4. Update the JYouPro App:
- Ensure the app is updated to the latest version from the Google Play Store.

5. App Permissions:
- Go to Settings > Apps > JYouPro.
- Check that Location and Bluetooth permissions are enabled, as these are critical for Bluetooth scanning and connection.

6. Put Device in Pairing Mode:
- Make sure your JYouPro device is actively in pairing mode. Usually, this means the device screen shows Bluetooth or is blinking a Bluetooth icon.

7. Attempt Re-pairing the Device:
- Open the JYouPro app.
- Follow the prompts to connect or search for the device again.

8. Clear App Cache & Data (if previous step fails):
- Settings > Apps > JYouPro > Storage > Clear Cache and Clear Data.
- Then restart the app and try again.

9. Keep Devices Close:
- Keep your phone and device within 1-2 feet during pairing to ensure strong Bluetooth signal.

If after trying all these you still can’t connect, please let me know what step failed or any errors you get. That way we can dig deeper or explore if a reset or firmware update might be needed.

Would you like me to walk you through any step in detail? Are you satisfied with this approach so far?