diff --git a/internal/controller/serverbootconfiguration_pxe_controller.go b/internal/controller/serverbootconfiguration_pxe_controller.go
index 27aa3182..c31b0cf8 100644
--- a/internal/controller/serverbootconfiguration_pxe_controller.go
+++ b/internal/controller/serverbootconfiguration_pxe_controller.go
@@ -219,42 +219,49 @@ func (r *ServerBootConfigurationPXEReconciler) getLayerDigestsFromNestedManifest
 		return "", "", "", fmt.Errorf("failed to resolve image reference: %w", err)
 	}
 
-	indexData, err := fetchContent(ctx, resolver, name, desc)
+	targetManifestDesc := desc
+	manifestData, err := fetchContent(ctx, resolver, name, desc)
 	if err != nil {
-		return "", "", "", fmt.Errorf("failed to fetch index manifest: %w", err)
+		return "", "", "", fmt.Errorf("failed to fetch manifest data: %w", err)
 	}
 
-	var indexManifest ocispec.Index
-	if err := json.Unmarshal(indexData, &indexManifest); err != nil {
+	var manifest ocispec.Manifest
+	if err := json.Unmarshal(manifestData, &manifest); err != nil {
 		return "", "", "", fmt.Errorf("failed to unmarshal index manifest: %w", err)
 	}
 
-	var targetManifestDesc ocispec.Descriptor
-	for _, manifest := range indexManifest.Manifests {
-		if strings.HasPrefix(manifest.Annotations["cname"], CNAMEPrefixMetalPXE) {
-			if manifest.Annotations["architecture"] == r.Architecture {
-				targetManifestDesc = manifest
-				break
-			}
+	if desc.MediaType == ocispec.MediaTypeImageIndex {
+		var indexManifest ocispec.Index
+		if err := json.Unmarshal(manifestData, &indexManifest); err != nil {
+			return "", "", "", fmt.Errorf("failed to unmarshal index manifest: %w", err)
 		}
-	}
 
-	if targetManifestDesc.Digest == "" {
-		return "", "", "", fmt.Errorf("failed to find target manifest with cname annotation")
-	}
+		for _, manifest := range indexManifest.Manifests {
+			if strings.HasPrefix(manifest.Annotations["cname"], CNAMEPrefixMetalPXE) {
+				if manifest.Annotations["architecture"] == r.Architecture {
+					targetManifestDesc = manifest
+					break
+				}
+			}
+		}
+		if targetManifestDesc.Digest == "" {
+			return "", "", "", fmt.Errorf("failed to find target manifest with cname annotation")
+		}
 
-	nestedData, err := fetchContent(ctx, resolver, name, targetManifestDesc)
-	if err != nil {
-		return "", "", "", fmt.Errorf("failed to fetch nested manifest: %w", err)
-	}
+		nestedData, err := fetchContent(ctx, resolver, name, targetManifestDesc)
+		if err != nil {
+			return "", "", "", fmt.Errorf("failed to fetch nested manifest: %w", err)
+		}
 
-	var nestedManifest ocispec.Manifest
-	if err := json.Unmarshal(nestedData, &nestedManifest); err != nil {
-		return "", "", "", fmt.Errorf("failed to unmarshal nested manifest: %w", err)
+		var nestedManifest ocispec.Manifest
+		if err := json.Unmarshal(nestedData, &nestedManifest); err != nil {
+			return "", "", "", fmt.Errorf("failed to unmarshal nested manifest: %w", err)
+		}
+		manifest = nestedManifest
 	}
 
 	var kernelDigest, initrdDigest, squashFSDigest string
-	for _, layer := range nestedManifest.Layers {
+	for _, layer := range manifest.Layers {
 		if layer.Annotations[AnnotationArchitecture] == r.Architecture {
 			switch layer.MediaType {
 			case MediaTypeKernel:
diff --git a/internal/controller/serverbootconfiguration_pxe_controller_test.go b/internal/controller/serverbootconfiguration_pxe_controller_test.go
index 628ee24f..bcad78eb 100644
--- a/internal/controller/serverbootconfiguration_pxe_controller_test.go
+++ b/internal/controller/serverbootconfiguration_pxe_controller_test.go
@@ -91,4 +91,65 @@ var _ = Describe("ServerBootConfiguration Controller", func() {
 			HaveField("Spec.IgnitionSecretRef.Name", "foo"),
 		))
 	})
+
+	It("should map a new ServerBootConfiguration", func(ctx SpecContext) {
+		By("creating a new Server object")
+		server := &metalv1alpha1.Server{
+			ObjectMeta: metav1.ObjectMeta{
+				GenerateName: "server-",
+			},
+			Spec: metalv1alpha1.ServerSpec{
+				UUID: "12345",
+			},
+		}
+		Expect(k8sClient.Create(ctx, server)).To(Succeed())
+
+		By("patching the Server NICs in Server status")
+		Eventually(UpdateStatus(server, func() {
+			server.Status.NetworkInterfaces = []metalv1alpha1.NetworkInterface{
+				{
+					Name:       "foo",
+					IP:         metalv1alpha1.MustParseIP("1.1.1.1"),
+					MACAddress: "abcd",
+				},
+			}
+		})).Should(Succeed())
+
+		By("creating a new ServerBootConfiguration")
+		config := &metalv1alpha1.ServerBootConfiguration{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace:    ns.Name,
+				GenerateName: "test-",
+			},
+			Spec: metalv1alpha1.ServerBootConfigurationSpec{
+				ServerRef: corev1.LocalObjectReference{
+					Name: server.Name,
+				},
+				Image:             "ghcr.io/gardenlinux/gardenlinux:1770.0-metal_pxe-arm64-1770.0-60d819dd-arm64",
+				IgnitionSecretRef: &corev1.LocalObjectReference{Name: "foo"},
+			},
+		}
+		Expect(k8sClient.Create(ctx, config)).To(Succeed())
+
+		By("ensuring that the ipxe boot configuration is correct")
+		bootConfig := &v1alpha1.IPXEBootConfig{
+			ObjectMeta: metav1.ObjectMeta{
+				Namespace: ns.Name,
+				Name:      config.Name,
+			},
+		}
+		Eventually(Object(bootConfig)).Should(SatisfyAll(
+			HaveField("OwnerReferences", ContainElement(metav1.OwnerReference{
+				APIVersion:         "metal.ironcore.dev/v1alpha1",
+				Kind:               "ServerBootConfiguration",
+				Name:               config.Name,
+				UID:                config.UID,
+				Controller:         ptr.To(true),
+				BlockOwnerDeletion: ptr.To(true),
+			})),
+			HaveField("Spec.SystemUUID", server.Spec.UUID),
+			HaveField("Spec.SystemIPs", ContainElement("1.1.1.1")),
+			HaveField("Spec.IgnitionSecretRef.Name", "foo"),
+		))
+	})
 })
diff --git a/internal/controller/suite_test.go b/internal/controller/suite_test.go
index b62aea08..144d77c3 100644
--- a/internal/controller/suite_test.go
+++ b/internal/controller/suite_test.go
@@ -132,7 +132,7 @@ func SetupTest() *corev1.Namespace {
 			Client:         k8sManager.GetClient(),
 			Scheme:         k8sManager.GetScheme(),
 			IPXEServiceURL: "http://localhost:5000",
-			Architecture:   "amd64",
+			Architecture:   "arm64",
 		}).SetupWithManager(k8sManager)).To(Succeed())
 
 		Expect((&ServerBootConfigurationHTTPReconciler{