To resolve the issue of the Yoho Sports app not opening on your A15 Samsung device after installation, follow these steps systematically:

1. Check for App Compatibility
- Ensure that your A15 Samsung device meets the app's system requirements. Sometimes, devices that are not up-to-date may struggle with new apps or features. You can check the Yoho Sports app page on the Google Play Store for any stated requirements - learn more.

2. Update Your Device Software
- Go to Settings > Software update and check for any available updates for your device. Install any updates if available to ensure that all system components are optimized for app performance.

3. Clear App Cache and Data
- Navigate to Settings > Apps > Yoho Sports.
- Tap on Storage and then select Clear Cache and Clear Data. This action can help remove corrupted data that may be preventing the app from opening.

4. Reinstall the App
- Uninstall the Yoho Sports app by going to Settings > Apps > Yoho Sports > Uninstall.
- After uninstalling, restart your device. Then, reinstall the app from the Google Play Store to ensure you have the latest version - learn more.

5. Check for Permissions
- Ensure that the app has all the necessary permissions to function correctly. Go to Settings > Apps > Yoho Sports > Permissions and make sure that it has permissions to access necessary features such as Bluetooth and location.

6. Reset Network Settings
- Sometimes network connectivity can cause issues with apps. Go to Settings > General Management > Reset > Reset Network Settings. This will reset Wi-Fi, mobile data, and Bluetooth settings, which might solve connectivity problems that affect the app.

7. Contact Support if the Issue Persists
- If the app still doesn’t open after performing the steps above, it may be helpful to reach out to Yoho Sports support for further assistance or check any relevant FAQs for specific troubleshooting guidance related to the app - learn more.

Following these steps should help you successfully open the Yoho Sports app on your A15 Samsung device.