Hi there! I'm here to help you with the issue you're experiencing while trying to update Toca Boca World. It sounds like the birthday pin pad is causing some trouble. Let's see if we can get this sorted out together!

1. Double-check your birthday input: Sometimes, ensuring that the correct format is used can help. Make sure you're entering the date in the format required by the game.

2. Restart your device: A simple restart can clear up many small glitches. Hold down the power button on your Kindle and select the option to restart.

3. Check for app updates: Ensure that you're using the latest version of Toca Boca World. You can do this by going to the Google Play Store, searching for Toca Boca World, and seeing if there's an "Update" button.

4. Clear app cache: Sometimes cached data can cause issues. Here are the steps:
- Go to Settings on your Kindle.
- Tap on Apps & Notifications (or similar options).
- Find Toca Boca World in the list and select it.
- Look for Storage and select it.
- Tap on Clear Cache.

5. Reinstalling the app: As a last resort, you can uninstall the app and reinstall it. This can sometimes resolve persistent issues. Just make sure your game data is backed up, if possible.

Please try these steps and let me know if there's any improvement or if the issue persists. If needed, I can assist you further!