Hi there! I’d like to help you with the issue of missing letters and numbers in the LetterSchool app on your Android device. To start, could you tell me a bit more about what’s happening? For example:

- Are only some letters or numbers missing, or are many not showing up?
- Did this happen suddenly after an update or reinstall?
- Are you using the free or paid version of the app?

This will help me guide you to the best solution. Meanwhile, many users find that missing letters or numbers can be linked to incomplete downloads or locked content if the full set hasn’t been unlocked yet.

In the meantime, here’s a general step-by-step you can try:

1. Check for Updates: Go to Google Play Store and see if there’s an update pending for LetterSchool. Installing the latest version can fix missing content issues.

2. Restart the App: Fully close the LetterSchool app on your device and then reopen it.

3. Restore Purchases: If you have a paid version or in-app purchases, open LetterSchool’s settings and look for a “Restore” or “Restore Purchases” button. This will re-enable any paid content including additional letters and numbers.

4. Clear Cache (Optional): On your Android 11 device, go to Settings > Apps > LetterSchool > Storage > Clear Cache. This clears temporary data and can fix display glitches without deleting your progress.

5. Reinstall the App: If none of the above works, try uninstalling and reinstalling the app. Be sure your progress is backed up or linked to an account if possible, so you don't lose any data.

If after these steps the letters or numbers still don’t appear, it might be related to account issues or specific device compatibility. In that case, I can help you escalate to LetterSchool support directly for deeper investigation.

Does this sound like a good place to start? Let me know what you’ve tried already or if you notice any error messages!