diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index ec865f6..e94db2d 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -6555,4 +6555,7 @@
     <string name="keyboard_shortcut_group_applications_maps">Maps</string>
     <!-- User visible title for the keyboard shortcut group containing system-wide application launch shortcuts. [CHAR-LIMIT=70] -->
     <string name="keyboard_shortcut_group_applications">Applications</string>
+
+    <!-- Fingerprint loe notification string -->
+    <string name="fingerprint_loe_notification_msg">Your fingerprints can no longer be recognized. Set up Fingerprint Unlock again.</string>
 </resources>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 6b58396..cbf3fe7 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -5584,4 +5584,7 @@
   <java-symbol type="string" name="keyboard_shortcut_group_applications_music" />
   <java-symbol type="string" name="keyboard_shortcut_group_applications_sms" />
   <java-symbol type="string" name="keyboard_shortcut_group_applications" />
+
+  <!-- Fingerprint loe notification string -->
+  <java-symbol type="string" name="fingerprint_loe_notification_msg" />
 </resources>
diff --git a/services/core/java/com/android/server/biometrics/biometrics.aconfig b/services/core/java/com/android/server/biometrics/biometrics.aconfig
index 92fd9cb..15c8850 100644
--- a/services/core/java/com/android/server/biometrics/biometrics.aconfig
+++ b/services/core/java/com/android/server/biometrics/biometrics.aconfig
@@ -14,3 +14,10 @@
   description: "This flag controls whether virtual HAL is used for testing instead of TestHal "
   bug: "294254230"
 }
+
+flag {
+  name: "notify_fingerprint_loe"
+  namespace: "biometrics_framework"
+  description: "This flag controls whether a notification should be sent to notify user when loss of enrollment happens"
+  bug: "351036558"
+}
diff --git a/services/core/java/com/android/server/biometrics/sensors/BiometricNotificationUtils.java b/services/core/java/com/android/server/biometrics/sensors/BiometricNotificationUtils.java
index 53e6bdb..27f9cc8 100644
--- a/services/core/java/com/android/server/biometrics/sensors/BiometricNotificationUtils.java
+++ b/services/core/java/com/android/server/biometrics/sensors/BiometricNotificationUtils.java
@@ -151,6 +151,43 @@
     }
 
     /**
+     * Shows a fingerprint notification for loss of enrollment
+     */
+    public static void showFingerprintLoeNotification(@NonNull Context context) {
+        Slog.d(TAG, "Showing fingerprint LOE notification");
+
+        final String name =
+                context.getString(R.string.device_unlock_notification_name);
+        final String title = context.getString(R.string.fingerprint_dangling_notification_title);
+        final String content = context.getString(R.string.fingerprint_loe_notification_msg);
+
+        // Create "Set up" notification action button.
+        final Intent setupIntent =
+                new Intent(BiometricDanglingReceiver.ACTION_FINGERPRINT_RE_ENROLL_LAUNCH);
+        final PendingIntent setupPendingIntent = PendingIntent.getBroadcastAsUser(context, 0,
+                setupIntent, PendingIntent.FLAG_IMMUTABLE, UserHandle.CURRENT);
+        final String setupText =
+                context.getString(R.string.biometric_dangling_notification_action_set_up);
+        final Notification.Action setupAction = new Notification.Action.Builder(
+                null, setupText, setupPendingIntent).build();
+
+        // Create "Not now" notification action button.
+        final Intent notNowIntent =
+                new Intent(BiometricDanglingReceiver.ACTION_FINGERPRINT_RE_ENROLL_DISMISS);
+        final PendingIntent notNowPendingIntent = PendingIntent.getBroadcastAsUser(context, 0,
+                notNowIntent, PendingIntent.FLAG_IMMUTABLE, UserHandle.CURRENT);
+        final String notNowText = context.getString(
+                R.string.biometric_dangling_notification_action_not_now);
+        final Notification.Action notNowAction = new Notification.Action.Builder(
+                null, notNowText, notNowPendingIntent).build();
+
+        showNotificationHelper(context, name, title, content, setupPendingIntent, setupAction,
+                notNowAction, Notification.CATEGORY_SYSTEM, FINGERPRINT_RE_ENROLL_CHANNEL,
+                FINGERPRINT_RE_ENROLL_NOTIFICATION_TAG, Notification.VISIBILITY_SECRET, false,
+                Notification.FLAG_NO_CLEAR);
+    }
+
+    /**
      * Shows a fingerprint bad calibration notification.
      */
     public static void showBadCalibrationNotification(@NonNull Context context) {
diff --git a/services/core/java/com/android/server/biometrics/sensors/BiometricUserState.java b/services/core/java/com/android/server/biometrics/sensors/BiometricUserState.java
index 7fb27b6..63678aa 100644
--- a/services/core/java/com/android/server/biometrics/sensors/BiometricUserState.java
+++ b/services/core/java/com/android/server/biometrics/sensors/BiometricUserState.java
@@ -57,6 +57,7 @@
     protected boolean mInvalidationInProgress;
     protected final Context mContext;
     protected final File mFile;
+    private boolean mIsInvalidBiometricState = false;
 
     private final Runnable mWriteStateRunnable = this::doWriteStateInternal;
 
@@ -102,7 +103,7 @@
             serializer.endDocument();
             destination.finishWrite(out);
         } catch (Throwable t) {
-            Slog.wtf(TAG, "Failed to write settings, restoring backup", t);
+            Slog.e(TAG, "Failed to write settings, restoring backup", t);
             destination.failWrite(out);
             throw new IllegalStateException("Failed to write to file: " + mFile.toString(), t);
         } finally {
@@ -192,6 +193,29 @@
         }
     }
 
+    /**
+     * Return true if the biometric file is correctly read. Otherwise return false.
+     */
+    public boolean isInvalidBiometricState() {
+        return mIsInvalidBiometricState;
+    }
+
+    /**
+     * Delete the file of the biometric state.
+     */
+    public void deleteBiometricFile() {
+        synchronized (this) {
+            if (!mFile.exists()) {
+                return;
+            }
+            if (mFile.delete()) {
+                Slog.i(TAG, mFile + " is deleted successfully");
+            } else {
+                Slog.i(TAG, "Failed to delete " + mFile);
+            }
+        }
+    }
+
     private boolean isUnique(String name) {
         for (T identifier : mBiometrics) {
             if (identifier.getName().equals(name)) {
@@ -218,7 +242,8 @@
         try {
             in = new FileInputStream(mFile);
         } catch (FileNotFoundException fnfe) {
-            Slog.i(TAG, "No fingerprint state");
+            Slog.i(TAG, "No fingerprint state", fnfe);
+            mIsInvalidBiometricState = true;
             return;
         }
         try {
diff --git a/services/core/java/com/android/server/biometrics/sensors/BiometricUtils.java b/services/core/java/com/android/server/biometrics/sensors/BiometricUtils.java
index ebe4679..0b4f640 100644
--- a/services/core/java/com/android/server/biometrics/sensors/BiometricUtils.java
+++ b/services/core/java/com/android/server/biometrics/sensors/BiometricUtils.java
@@ -33,4 +33,14 @@
     CharSequence getUniqueName(Context context, int userId);
     void setInvalidationInProgress(Context context, int userId, boolean inProgress);
     boolean isInvalidationInProgress(Context context, int userId);
+
+    /**
+     * Return true if the biometric file is correctly read. Otherwise return false.
+     */
+    boolean hasValidBiometricUserState(Context context, int userId);
+
+    /**
+     * Delete the file of the biometric state.
+     */
+    void deleteStateForUser(int userId);
 }
\ No newline at end of file
diff --git a/services/core/java/com/android/server/biometrics/sensors/InternalCleanupClient.java b/services/core/java/com/android/server/biometrics/sensors/InternalCleanupClient.java
index 69ad152..3b6aeef 100644
--- a/services/core/java/com/android/server/biometrics/sensors/InternalCleanupClient.java
+++ b/services/core/java/com/android/server/biometrics/sensors/InternalCleanupClient.java
@@ -25,6 +25,7 @@
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.server.biometrics.BiometricsProto;
+import com.android.server.biometrics.Flags;
 import com.android.server.biometrics.log.BiometricContext;
 import com.android.server.biometrics.log.BiometricLogger;
 
@@ -62,7 +63,7 @@
     }
 
     private final ArrayList<UserTemplate> mUnknownHALTemplates = new ArrayList<>();
-    private final BiometricUtils<S> mBiometricUtils;
+    protected final BiometricUtils<S> mBiometricUtils;
     private final Map<Integer, Long> mAuthenticatorIds;
     private final boolean mHasEnrollmentsBeforeStarting;
     private BaseClientMonitor mCurrentTask;
@@ -105,6 +106,11 @@
                     startCleanupUnknownHalTemplates();
                 }
             }
+
+            if (mBiometricUtils.hasValidBiometricUserState(getContext(), getTargetUserId())
+                    && Flags.notifyFingerprintLoe()) {
+                handleInvalidBiometricState();
+            }
         }
     };
 
@@ -248,4 +254,8 @@
     public ArrayList<UserTemplate> getUnknownHALTemplates() {
         return mUnknownHALTemplates;
     }
+
+    protected void handleInvalidBiometricState() {}
+
+    protected abstract int getModality();
 }
diff --git a/services/core/java/com/android/server/biometrics/sensors/face/FaceUtils.java b/services/core/java/com/android/server/biometrics/sensors/face/FaceUtils.java
index c574478..79285cb 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/FaceUtils.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/FaceUtils.java
@@ -124,6 +124,22 @@
         return getStateForUser(context, userId).isInvalidationInProgress();
     }
 
+    @Override
+    public boolean hasValidBiometricUserState(Context context, int userId) {
+        return getStateForUser(context, userId).isInvalidBiometricState();
+    }
+
+    @Override
+    public void deleteStateForUser(int userId) {
+        synchronized (this) {
+            FaceUserState state = mUserStates.get(userId);
+            if (state != null) {
+                state.deleteBiometricFile();
+                mUserStates.delete(userId);
+            }
+        }
+    }
+
     private FaceUserState getStateForUser(Context ctx, int userId) {
         synchronized (this) {
             FaceUserState state = mUserStates.get(userId);
diff --git a/services/core/java/com/android/server/biometrics/sensors/face/aidl/FaceInternalCleanupClient.java b/services/core/java/com/android/server/biometrics/sensors/face/aidl/FaceInternalCleanupClient.java
index e75c6ab..964bf6c 100644
--- a/services/core/java/com/android/server/biometrics/sensors/face/aidl/FaceInternalCleanupClient.java
+++ b/services/core/java/com/android/server/biometrics/sensors/face/aidl/FaceInternalCleanupClient.java
@@ -19,6 +19,7 @@
 import android.annotation.NonNull;
 import android.content.Context;
 import android.hardware.biometrics.BiometricAuthenticator;
+import android.hardware.biometrics.BiometricsProtoEnums;
 import android.hardware.biometrics.face.IFace;
 import android.hardware.face.Face;
 import android.os.IBinder;
@@ -77,4 +78,9 @@
         FaceUtils.getInstance(getSensorId()).addBiometricForUser(
                 getContext(), getTargetUserId(), (Face) identifier);
     }
+
+    @Override
+    protected int getModality() {
+        return BiometricsProtoEnums.MODALITY_FACE;
+    }
 }
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintUtils.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintUtils.java
index 0062d31..b8c06c7 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintUtils.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/FingerprintUtils.java
@@ -140,6 +140,22 @@
         return getStateForUser(context, userId).isInvalidationInProgress();
     }
 
+    @Override
+    public boolean hasValidBiometricUserState(Context context, int userId) {
+        return getStateForUser(context, userId).isInvalidBiometricState();
+    }
+
+    @Override
+    public void deleteStateForUser(int userId) {
+        synchronized (this) {
+            FingerprintUserState state = mUserStates.get(userId);
+            if (state != null) {
+                state.deleteBiometricFile();
+                mUserStates.delete(userId);
+            }
+        }
+    }
+
     private FingerprintUserState getStateForUser(Context ctx, int userId) {
         synchronized (this) {
             FingerprintUserState state = mUserStates.get(userId);
diff --git a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClient.java b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClient.java
index 5edc2ca..1fc5179 100644
--- a/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClient.java
+++ b/services/core/java/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClient.java
@@ -22,9 +22,11 @@
 import android.hardware.biometrics.BiometricsProtoEnums;
 import android.hardware.fingerprint.Fingerprint;
 import android.os.IBinder;
+import android.util.Slog;
 
 import com.android.server.biometrics.log.BiometricContext;
 import com.android.server.biometrics.log.BiometricLogger;
+import com.android.server.biometrics.sensors.BiometricNotificationUtils;
 import com.android.server.biometrics.sensors.BiometricUtils;
 import com.android.server.biometrics.sensors.InternalCleanupClient;
 import com.android.server.biometrics.sensors.InternalEnumerateClient;
@@ -42,6 +44,8 @@
 public class FingerprintInternalCleanupClient
         extends InternalCleanupClient<Fingerprint, AidlSession> {
 
+    private static final String TAG = "FingerprintInternalCleanupClient";
+
     public FingerprintInternalCleanupClient(@NonNull Context context,
             @NonNull Supplier<AidlSession> lazyDaemon,
             int userId, @NonNull String owner, int sensorId,
@@ -80,4 +84,16 @@
         FingerprintUtils.getInstance(getSensorId()).addBiometricForUser(
                 getContext(), getTargetUserId(), (Fingerprint) identifier);
     }
+
+    @Override
+    public void handleInvalidBiometricState() {
+        Slog.d(TAG, "Invalid fingerprint user state: delete the state.");
+        mBiometricUtils.deleteStateForUser(getTargetUserId());
+        BiometricNotificationUtils.showFingerprintLoeNotification(getContext());
+    }
+
+    @Override
+    protected int getModality() {
+        return BiometricsProtoEnums.MODALITY_FINGERPRINT;
+    }
 }
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/BiometricSchedulerTest.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/BiometricSchedulerTest.java
index 3789531..36a7b3d 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/BiometricSchedulerTest.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/BiometricSchedulerTest.java
@@ -1296,6 +1296,11 @@
             mFingerprints.add((Fingerprint) identifier);
         }
 
+        @Override
+        protected int getModality() {
+            return 0;
+        }
+
         public List<Fingerprint> getFingerprints() {
             return mFingerprints;
         }
diff --git a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClientTest.java b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClientTest.java
index c9482ce..a34e796 100644
--- a/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClientTest.java
+++ b/services/tests/servicestests/src/com/android/server/biometrics/sensors/fingerprint/aidl/FingerprintInternalCleanupClientTest.java
@@ -19,6 +19,7 @@
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.eq;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
@@ -30,12 +31,16 @@
 import android.hardware.fingerprint.Fingerprint;
 import android.os.RemoteException;
 import android.platform.test.annotations.Presubmit;
+import android.platform.test.annotations.RequiresFlagsEnabled;
+import android.platform.test.flag.junit.CheckFlagsRule;
+import android.platform.test.flag.junit.DeviceFlagsValueProvider;
 import android.testing.TestableContext;
 
 import androidx.annotation.NonNull;
 import androidx.test.filters.SmallTest;
 import androidx.test.platform.app.InstrumentationRegistry;
 
+import com.android.server.biometrics.Flags;
 import com.android.server.biometrics.log.BiometricContext;
 import com.android.server.biometrics.log.BiometricLogger;
 import com.android.server.biometrics.sensors.ClientMonitorCallback;
@@ -69,6 +74,10 @@
     public final TestableContext mContext = new TestableContext(
             InstrumentationRegistry.getInstrumentation().getTargetContext(), null);
 
+    @Rule
+    public final CheckFlagsRule mCheckFlagsRule =
+            DeviceFlagsValueProvider.createCheckFlagsRule();
+
     @Mock
     ISession mSession;
     @Mock
@@ -168,6 +177,21 @@
         assertThat(mClient.getUnknownHALTemplates()).isEmpty();
     }
 
+    @Test
+    @RequiresFlagsEnabled(Flags.FLAG_NOTIFY_FINGERPRINT_LOE)
+    public void invalidBiometricUserState() throws Exception {
+        mClient =  createClient();
+
+        final List<Fingerprint> list = new ArrayList<>();
+        doReturn(true).when(mFingerprintUtils)
+                .hasValidBiometricUserState(mContext, 2);
+        doReturn(list).when(mFingerprintUtils).getBiometricsForUser(mContext, 2);
+
+        mClient.start(mCallback);
+        mClient.onEnumerationResult(null, 0);
+        verify(mFingerprintUtils).deleteStateForUser(2);
+    }
+
     protected FingerprintInternalCleanupClient createClient() {
         final Map<Integer, Long> authenticatorIds = new HashMap<>();
         return new FingerprintInternalCleanupClient(mContext, () -> mAidlSession, 2 /* userId */,