To resolve the issue with the NoiseFit app not opening and your watch not updating, follow these step-by-step instructions:

1. Check for App Updates: Ensure that the NoiseFit app is updated to the latest version. Go to the Google Play Store on your Android device, search for "NoiseFit," and see if there is an available update. If there is, install it.

2. Clear App Cache and Data: Sometimes, cached data can cause the app to malfunction. To clear the cache and data:
- Go to Settings on your device.
- Select Apps or Application Manager.
- Find and tap on NoiseFit.
- Tap Storage, then select Clear Cache and Clear Data.

3. Reinstall the App: If the issue persists after clearing the cache:
- Uninstall the NoiseFit app from your device by going to the Google Play Store, searching for NoiseFit, and selecting "Uninstall."
- Reboot your device and then reinstall the app from the Google Play Store.

4. Check Network Connection: Ensure that your device has a stable internet connection. If you are using mobile data, try switching to Wi-Fi and vice versa to see if the app opens correctly.

5. Update Your Watch: To update your watch, follow these steps:
- Open the NoiseFit app on your device.
- Navigate to Settings and select your watch model (e.g., Colorfit Pulse Grand).
- Click on Check for Update. If an update is available, follow the on-screen instructions to complete the update process - learn more - learn more.

6. Restart Your Device: Sometimes, simply restarting your phone can help resolve the issue.

7. Check Permissions: Ensure that the NoiseFit app has all the necessary permissions to function correctly. Go to Settings > Apps > NoiseFit > Permissions, and make sure all relevant permissions (like storage and location) are granted.

8. Contact Support: If none of the above steps work, it might be best to contact Noise support for further assistance. You can find help on their official support page.

By following these steps, you should be able to resolve the issues with the NoiseFit app not opening and the watch not updating.