Hello! I understand your YouFs-A app is not working at all, and you'd like help to get it running. To assist you best, could you please share a bit more about what happens when you try to use the app? For example:

- Does the app open but doesn't respond?
- Are you unable to log in or connect to your scooter/device?
- Do you see any error messages or does it just crash?

Knowing these details will help me guide you through the right steps for your Android 10 device with WebKit browser.

In the meantime, here’s a general step-by-step approach to troubleshoot the YouFs-A app issues:

1. Restart the Device: Sometimes a simple reboot of your phone can clear temporary glitches.

2. Check for App Updates: Go to Google Play Store, search for YouFs-A, and see if an update is available. Running the latest version ensures bug fixes and compatibility.

3. Clear App Cache and Data:
- Open Settings on your Android.
- Go to Apps & notifications > See all apps > YouFs-A.
- Tap Storage & cache.
- Choose Clear Cache, then if needed Clear Storage/Data (note: clearing data may log you out).
- Restart the app and try again.

4. Reinstall the App: Uninstall YouFs-A and then reinstall it fresh from Google Play.

5. Bluetooth & Permissions: Ensure your phone’s Bluetooth is turned on if the app connects to your scooter that way. Also, check in app permissions that YouFs-A has access to Bluetooth, location, and storage.

6. Scooter Reset: Some users found success by resetting their scooter before connecting it. You can try turning off the scooter, holding the brake with one hand, throttle with the other, and then powering it back on—this procedure can refresh the connection.

If the app opens but freezes or settings only apply briefly before crashing, this might be a known instability reported by other users and could be related to app bugs or compatibility issues.

If you can provide more specific details about your exact problem (error codes, symptoms), I can help with more targeted steps or corrections based on that.

Are you satisfied with these first solutions or would you like me to walk you through any of the steps in more detail?