To resolve the issue of the Nusuk app crashing or being unable to open, follow these thorough steps:

Clear App Cache and Data

1. Go to Settings on your device.
2. Select Apps or Application Manager (the exact naming may vary based on your device).
3. Find and tap on Nusuk app from the list.
4. Tap on Storage.
5. Click on Clear Cache. Afterward, select Clear Data (this may log you out of the app, but it can solve many issues).

Check for App Updates

1. Open Google Play Store.
2. Search for Nusuk in the search bar.
3. If an Update button is visible, tap on it to install the latest version, as updates often come with bug fixes.
4. Restart your device after the update is completed.

Reboot Your Device

1. Press and hold the Power button until the power menu appears.
2. Tap on Restart or Reboot. This can help clear temporary glitches in the system.

Uninstall and Reinstall the App

1. Open Google Play Store again.
2. Search for Nusuk.
3. Tap on Uninstall and confirm your action.
4. After the app is uninstalled, tap on Install to download it again.
5. Open the app to check if the issue persists.

Disable Battery Optimization

1. Go to Settings.
2. Tap on Battery or Battery Usage.
3. Select Battery Optimization and find Nusuk.
4. Make sure to set it to Not Optimized to help it run smoothly.

Check Your Internet Connection

1. Ensure your Wi-Fi or Mobile Data is turned on and has a stable connection.
2. Try switching between Wi-Fi and mobile data to see if the issue is network related.

Seek Further Assistance

If the above steps do not resolve the crashing issues, consider reaching out for support either through:

- Nusuk Official Support page or community forums for similar issues.
- Consulting video tutorials for visual guidance - you can refer to Video Tutorial on Fixing Nusuk App - [learn more].

By following these steps, you should be able to troubleshoot and possibly resolve the issues you are facing with the Nusuk app.