To resolve issues with the HiTV app not functioning properly, whether with or without a VPN, and to address the limited availability of series, follow these steps:

1. Check Internet Connection

Ensure that your internet connection is stable. You can do this by:

- Switching between Wi-Fi and mobile data (4G/5G).
- Restarting your router and modem if you're using Wi-Fi.

2. Clear App Cache and Data

Clearing the app’s cache and data can resolve many issues:

- Go to Settings on your Android device.
- Tap on Apps or Application Manager.
- Find and select HiTV.
- Tap on Storage.
- Select Clear Cache and then Clear Data.

This will remove any stored data that may be causing conflicts - learn more.

3. Update the HiTV App

Make sure that you have the latest version of the HiTV app:

- Open the Google Play Store.
- Search for HiTV.
- If an update is available, tap Update.

Keeping the app updated ensures you have the latest features and bug fixes - learn more.

4. Restart Your Device

A simple restart can fix many temporary issues:

- Hold the power button until you see the option to Restart or Reboot.
- Select it and wait for the device to reboot.

5. Use a Reliable VPN

If you continue facing geographical restrictions, using a reputable VPN is necessary:

- Choose a VPN known for bypassing restrictions. Ensure your VPN is on before launching the HiTV app.
- Connect to a server location that supports HiTV content.

If issues persist despite using a VPN, consider switching to another server location or checking if the service permits access - learn more.

6. Check for System Updates

Make sure your device’s operating system is up to date:

- Go to Settings.
- Navigate to System.
- Select Software Update and check for any updates available.

7. Reinstall the App

If the app is still not functioning properly, uninstall and then reinstall it:

- Hold the HiTV app icon and select Uninstall.
- Go to the Google Play Store, search for HiTV, and reinstall.

8. Review the Series Availability

The limited availability of series may depend on regional licensing agreements. Check if the content you are looking for is available in your region by:

- Looking for alternative platforms or services that may offer the desired series.
- Engaging with forums or communities that share information on available series and their locations - learn more.

By following these steps, you should be able to diagnose and possibly rectify the issues you're encountering with HiTV. If problems persist, consider reaching out to HiTV’s customer support for further assistance.