# The app is not installed, and Google Play Protect is already disabled.

**Issue**

> On some Samsung devices, the Agent app may show *“App not installed”* or fail to run, even if you have already disabled Google Play Protect.

**Possible Causes**

1. **Samsung Device Security (McAfee)**
   * Samsung phones include their own “Device security” layer (powered by McAfee) in addition to Google Play Protect.
   * This may automatically block installation of apps that request sensitive permissions (SMS, Call Log, Location, Microphone, etc.).
2. **Package signature conflict**
   * If another app with the same package name (`applicationId`) was installed earlier with a different signing key, Android will refuse to install the new APK.
3. **Incompatible CPU architecture (ABI)**
   * Some APK builds are only packaged for `x86` or `armeabi-v7a`.
   * Samsung Galaxy devices (e.g. Galaxy A30, A50, etc.) require `arm64-v8a` support.
4. **Unknown sources not allowed.**
   * On Samsung, you must explicitly enable installation from the source app (e.g., Chrome, My Files, or a file manager).

**Solutions**

* Go to **Settings → Biometrics and security → Device security** and temporarily disable McAfee/Device security before installing.
* Make sure **Install unknown apps** is enabled for the installer you are using (`Settings → Apps → Special access → Install unknown apps`).
* Uninstall any previous version of the app completely (choose *Uninstall for all users*).
* Check that the APK is built for **arm64-v8a** (or as a universal APK).
* If installation still fails, connect your device to a PC and run:

  ```bash
  adb logcat | grep -i PackageManager
  ```

  This will show the exact reason (signature mismatch, ABI not supported, insufficient storage, etc.).

**Note**\
Some newer Samsung devices (running One UI 6 and later) also include **Auto Blocker**, which prevents sideloading by default. This must also be turned off in **Settings → Security and privacy → Auto Blocker**.