Experiencing issues connecting Firestore documents on Android 15, even after implementing the necessary modules, can be frustrating. This guide specifically addresses the problem seen with Hyperos2 and provides a solution.

You might be seeing a 'not connected' error in the Firebase Cloud Messaging (FCM) diagnosis, and your app isn't initiating a connection. The root cause often lies in the way Hyperos2 manages background connections, and it requires a tweak in the system settings.

The solution involves granting Google Play Services permission to connect to the internet regardless of power or performance mode in Hyperceiler.

**Here are the steps to fix the issue:**

1. **Open Hyperceiler**
2. **Navigate to the Permissions section**
3. **Within the 'Power & Performance' settings, ensure that 'Allow Google Play Services to connect at all times' is enabled.**

This adjustment will permit your app to establish and maintain the Firestore connection even when running in power-saving modes, resolving the 'not connected' error.

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