diff --git a/sample/src/main/java/io/runtime/mcumgr/sample/dialog/YesNoDialogFragment.java b/sample/src/main/java/io/runtime/mcumgr/sample/dialog/YesNoDialogFragment.java
new file mode 100644
index 00000000..77dc8fb3
--- /dev/null
+++ b/sample/src/main/java/io/runtime/mcumgr/sample/dialog/YesNoDialogFragment.java
@@ -0,0 +1,55 @@
+package io.runtime.mcumgr.sample.dialog;
+
+import android.app.Dialog;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+
+public class YesNoDialogFragment extends DialogFragment {
+	private static final String ARG_REQUEST_ID = "requestId";
+	private static final String ARG_TITLE_ID = "titleId";
+	private static final String ARG_QUESTION_ID = "questionId";
+
+	public interface Listener {
+		void onAnswer(final int requestId, final boolean yes);
+	}
+
+	public static DialogFragment getInstance(final int requestId,
+											 @StringRes final int titleId, @StringRes final int questionId) {
+		final DialogFragment fragment = new YesNoDialogFragment();
+
+		final Bundle args = new Bundle();
+		args.putInt(ARG_REQUEST_ID, requestId);
+		args.putInt(ARG_TITLE_ID, titleId);
+		args.putInt(ARG_QUESTION_ID, questionId);
+		fragment.setArguments(args);
+
+		return fragment;
+	}
+
+	@NonNull
+	@Override
+	public Dialog onCreateDialog(@Nullable final Bundle savedInstanceState) {
+		final Bundle args = requireArguments();
+		final int requestId = args.getInt(ARG_REQUEST_ID);
+
+		return new AlertDialog.Builder(requireContext())
+				.setTitle(args.getInt(ARG_TITLE_ID))
+				.setMessage(args.getInt(ARG_QUESTION_ID))
+				.setPositiveButton(android.R.string.yes, (dialog, which) -> {
+					final Listener listener = (Listener) getParentFragment();
+					if (listener != null)
+						listener.onAnswer(requestId, true);
+				})
+				.setNegativeButton(android.R.string.cancel, (dialog, which) -> {
+					final Listener listener = (Listener) getParentFragment();
+					if (listener != null)
+						listener.onAnswer(requestId, false);
+				})
+				.create();
+	}
+}
diff --git a/sample/src/main/java/io/runtime/mcumgr/sample/fragment/mcumgr/ImageUploadFragment.java b/sample/src/main/java/io/runtime/mcumgr/sample/fragment/mcumgr/ImageUploadFragment.java
index 545afa04..c5c290bb 100644
--- a/sample/src/main/java/io/runtime/mcumgr/sample/fragment/mcumgr/ImageUploadFragment.java
+++ b/sample/src/main/java/io/runtime/mcumgr/sample/fragment/mcumgr/ImageUploadFragment.java
@@ -32,12 +32,15 @@
 import io.runtime.mcumgr.sample.di.Injectable;
 import io.runtime.mcumgr.sample.dialog.HelpDialogFragment;
 import io.runtime.mcumgr.sample.dialog.SelectImageDialogFragment;
+import io.runtime.mcumgr.sample.dialog.YesNoDialogFragment;
 import io.runtime.mcumgr.sample.utils.StringUtils;
 import io.runtime.mcumgr.sample.viewmodel.mcumgr.ImageUploadViewModel;
 import io.runtime.mcumgr.sample.viewmodel.mcumgr.McuMgrViewModelFactory;
 
-public class ImageUploadFragment extends FileBrowserFragment implements Injectable, SelectImageDialogFragment.OnImageSelectedListener {
+public class ImageUploadFragment extends FileBrowserFragment implements Injectable,
+        SelectImageDialogFragment.OnImageSelectedListener, YesNoDialogFragment.Listener {
     private static final int REQUEST_UPLOAD = 0;
+    private static final int REQUEST_OVERWRITE = 1;
 
     @Inject
     McuMgrViewModelFactory viewModelFactory;
@@ -127,6 +130,12 @@ public void onViewCreated(@NonNull final View view, @Nullable final Bundle saved
             binding.actionCancel.setVisibility(View.GONE);
             binding.actionPauseResume.setVisibility(View.GONE);
         });
+        viewModel.getHashAlreadyFoundEvent().observe(getViewLifecycleOwner(), isActive -> {
+            final DialogFragment dialog = YesNoDialogFragment
+                    .getInstance(REQUEST_OVERWRITE, R.string.image_overwrite_title,
+                            isActive ? R.string.image_overwrite_active_message : R.string.image_overwrite_message);
+            dialog.show(getChildFragmentManager(), null);
+        });
         viewModel.getBusyState().observe(getViewLifecycleOwner(), busy -> {
             binding.actionSelectFile.setEnabled(!busy);
             binding.actionUpload.setEnabled(isFileLoaded() && !busy);
@@ -208,7 +217,21 @@ protected void onFileLoadingFailed(final int error) {
     public void onImageSelected(final int requestId, final int image) {
         final byte[] data = getFileContent();
         if (data != null) {
-            viewModel.upload(data, image);
+            viewModel.upload(data, image, false);
+        }
+    }
+
+    @Override
+    public void onAnswer(int requestId, boolean yes) {
+        if (requestId == REQUEST_OVERWRITE) {
+            final byte[] data = getFileContent();
+            if (data != null) {
+                if (yes) {
+                    viewModel.upload(data, 0, true);
+                } else {
+                    viewModel.onUploadCanceled();
+                }
+            }
         }
     }
 
diff --git a/sample/src/main/java/io/runtime/mcumgr/sample/viewmodel/mcumgr/ImageUploadViewModel.java b/sample/src/main/java/io/runtime/mcumgr/sample/viewmodel/mcumgr/ImageUploadViewModel.java
index d5f21436..3ce579ee 100644
--- a/sample/src/main/java/io/runtime/mcumgr/sample/viewmodel/mcumgr/ImageUploadViewModel.java
+++ b/sample/src/main/java/io/runtime/mcumgr/sample/viewmodel/mcumgr/ImageUploadViewModel.java
@@ -56,6 +56,7 @@ public boolean canCancel() {
     private final MutableLiveData<Float> transferSpeedLiveData = new MutableLiveData<>();
     private final SingleLiveEvent<McuMgrException> errorLiveData = new SingleLiveEvent<>();
     private final SingleLiveEvent<Void> cancelledEvent = new SingleLiveEvent<>();
+    private final SingleLiveEvent<Boolean> hashAlreadyFound = new SingleLiveEvent<>();
 
     private long uploadStartTimestamp;
     private int initialBytes;
@@ -97,7 +98,12 @@ public LiveData<Void> getCancelledEvent() {
         return cancelledEvent;
     }
 
-    public void upload(@NonNull final byte[] data, final int image) {
+    @NonNull
+    public LiveData<Boolean> getHashAlreadyFoundEvent() {
+        return hashAlreadyFound;
+    }
+
+    public void upload(@NonNull final byte[] data, final int image, boolean force) {
         if (controller != null) {
             return;
         }
@@ -117,7 +123,6 @@ public void upload(@NonNull final byte[] data, final int image) {
         }
         final byte[] hash = tmpHash;
 
-        requestHighConnectionPriority();
         manager.list(new McuMgrCallback<>() {
             @Override
             public void onResponse(@NonNull final McuMgrImageStateResponse response) {
@@ -130,16 +135,13 @@ public void onResponse(@NonNull final McuMgrImageStateResponse response) {
                     }
                 }
                 // If yes, no need to send again.
-                if (theSameImage != null) {
-                    if (theSameImage.slot == 0) {
-                        errorLiveData.postValue(new McuMgrException("Firmware already active."));
-                    } else {
-                        // Firmware is identical to one on slot 1. No need to send anything.
-                        stateLiveData.postValue(State.COMPLETE);
-                    }
+                if (!force && theSameImage != null) {
+                    hashAlreadyFound.postValue(theSameImage.active);
                     postReady();
                     return;
                 }
+
+                requestHighConnectionPriority();
                 // Otherwise, send the firmware. This may return NO MEMORY error if slot 1 is
                 // filled with an image with pending or confirmed flags set.
                 stateLiveData.postValue(State.UPLOADING);
@@ -229,16 +231,14 @@ public void onUploadCompleted() {
 
     private void requestHighConnectionPriority() {
         final McuMgrTransport transporter = manager.getTransporter();
-        if (transporter instanceof McuMgrBleTransport) {
-            final McuMgrBleTransport bleTransporter = (McuMgrBleTransport) transporter;
+        if (transporter instanceof McuMgrBleTransport bleTransporter) {
             bleTransporter.requestConnPriority(ConnectionPriorityRequest.CONNECTION_PRIORITY_HIGH);
         }
     }
 
     private void setLoggingEnabled(final boolean enabled) {
         final McuMgrTransport transporter = manager.getTransporter();
-        if (transporter instanceof McuMgrBleTransport) {
-            final McuMgrBleTransport bleTransporter = (McuMgrBleTransport) transporter;
+        if (transporter instanceof McuMgrBleTransport bleTransporter) {
             bleTransporter.setLoggingEnabled(enabled);
         }
     }
diff --git a/sample/src/main/res/values/strings_image_upload.xml b/sample/src/main/res/values/strings_image_upload.xml
index 71a0c4e4..df0c1fee 100644
--- a/sample/src/main/res/values/strings_image_upload.xml
+++ b/sample/src/main/res/values/strings_image_upload.xml
@@ -23,6 +23,10 @@
         <item>Image 3 (3)</item>
     </string-array>
 
+    <string name="image_overwrite_title">Overwrite?</string>
+    <string name="image_overwrite_message">The selected image is already on the device. Do you want to send it again?</string>
+    <string name="image_overwrite_active_message">The selected image is already active. Do you want to send it again?</string>
+
     <string name="image_upload_status_ready">READY</string>
     <string name="image_upload_status_validating">VALIDATING…</string>
     <string name="image_upload_status_uploading">UPLOADING…</string>