diff --git a/packages/react-native/Libraries/AppDelegate/RCTLegacyInteropComponents.mm b/packages/react-native/Libraries/AppDelegate/RCTLegacyInteropComponents.mm
index d1d68376b08493..549e41a9b91b5f 100644
--- a/packages/react-native/Libraries/AppDelegate/RCTLegacyInteropComponents.mm
+++ b/packages/react-native/Libraries/AppDelegate/RCTLegacyInteropComponents.mm
@@ -1,3 +1,4 @@
+
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  *
@@ -11,7 +12,7 @@ @implementation RCTLegacyInteropComponents
 
 + (NSArray<NSString *> *)legacyInteropComponents
 {
-  return @[];
+  return @[ @"RNTMyLegacyNativeView" ];
 }
 
 @end
diff --git a/packages/rn-tester/RNTester/AppDelegate.h b/packages/rn-tester/RNTester/AppDelegate.h
index 55625d8693c2a8..d172167ee1d627 100644
--- a/packages/rn-tester/RNTester/AppDelegate.h
+++ b/packages/rn-tester/RNTester/AppDelegate.h
@@ -5,13 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+#import <RCTAppDelegate.h>
 #import <UIKit/UIKit.h>
 
-@class RCTBridge;
-
-@interface AppDelegate : UIResponder <UIApplicationDelegate>
-
-@property (nonatomic, strong) UIWindow *window;
-@property (nonatomic, readonly) RCTBridge *bridge;
+@interface AppDelegate : RCTAppDelegate
 
 @end
diff --git a/packages/rn-tester/RNTester/AppDelegate.mm b/packages/rn-tester/RNTester/AppDelegate.mm
index bb1cbe68f73ee8..9b92dbc99b5bd9 100644
--- a/packages/rn-tester/RNTester/AppDelegate.mm
+++ b/packages/rn-tester/RNTester/AppDelegate.mm
@@ -7,152 +7,42 @@
 
 #import "AppDelegate.h"
 
-#ifndef RCT_USE_HERMES
-#if __has_include(<reacthermes/HermesExecutorFactory.h>)
-#define RCT_USE_HERMES 1
-#else
-#define RCT_USE_HERMES 0
-#endif
-#endif
-
-#ifdef RCT_NEW_ARCH_ENABLED
-#ifndef RN_FABRIC_ENABLED
-#define RN_FABRIC_ENABLED
-#endif
-#endif
-
-#if RCT_USE_HERMES
-#import <reacthermes/HermesExecutorFactory.h>
-#else
-#import <React/JSCExecutorFactory.h>
-#endif
-
-#import <React/RCTBridge.h>
 #import <React/RCTBundleURLProvider.h>
-#import <React/RCTCxxBridgeDelegate.h>
-#import <React/RCTDataRequestHandler.h>
-#import <React/RCTFileRequestHandler.h>
-#import <React/RCTGIFImageDecoder.h>
-#import <React/RCTHTTPRequestHandler.h>
-#import <React/RCTImageLoader.h>
-#import <React/RCTJSIExecutorRuntimeInstaller.h>
-#import <React/RCTJavaScriptLoader.h>
 #import <React/RCTLinkingManager.h>
-#import <React/RCTLocalAssetImageLoader.h>
-#import <React/RCTNetworking.h>
-#import <React/RCTRootView.h>
-
-#import <cxxreact/JSExecutor.h>
+#import "RNTesterTurboModuleProvider.h"
 
 #if !TARGET_OS_TV && !TARGET_OS_UIKITFORMAC
 #import <React/RCTPushNotificationManager.h>
 #endif
 
-#ifdef RN_FABRIC_ENABLED
-#import <React/RCTComponentViewFactory.h>
-#import <React/RCTFabricSurfaceHostingProxyRootView.h>
-#import <React/RCTSurfacePresenter.h>
-#import <React/RCTSurfacePresenterBridgeAdapter.h>
-
-#import <React/RCTLegacyViewManagerInteropComponentView.h>
-#import <react/config/ReactNativeConfig.h>
-#import <react/renderer/runtimescheduler/RuntimeScheduler.h>
-#import <react/renderer/runtimescheduler/RuntimeSchedulerBinding.h>
-#import <react/renderer/runtimescheduler/RuntimeSchedulerCallInvoker.h>
-#endif
-
-#if RCT_NEW_ARCH_ENABLED
-#import <RNTMyNativeViewComponentView.h>
-#endif
-
-#if DEBUG
-#ifdef FB_SONARKIT_ENABLED
-#import <FlipperKit/FlipperClient.h>
-#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
-#import <FlipperKitLayoutPlugin/SKDescriptorMapper.h>
-#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
-#import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>
-#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
-#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
-#endif
-#endif
+// RCTImage
+#import <React/RCTGIFImageDecoder.h>
+#import <React/RCTImageLoader.h>
+#import <React/RCTImageURLLoader.h>
+#import <React/RCTLocalAssetImageLoader.h>
 
-#import <ReactCommon/RCTTurboModuleManager.h>
-#import "RNTesterTurboModuleProvider.h"
+// RCTNetworking
+#import <React/RCTNetworking.h>
 
-@interface AppDelegate () <RCTCxxBridgeDelegate, RCTTurboModuleManagerDelegate> {
-#ifdef RN_FABRIC_ENABLED
-  RCTSurfacePresenterBridgeAdapter *_bridgeAdapter;
-  std::shared_ptr<const facebook::react::ReactNativeConfig> _reactNativeConfig;
-  facebook::react::ContextContainer::Shared _contextContainer;
-  std::shared_ptr<facebook::react::RuntimeScheduler> _runtimeScheduler;
-#endif
-}
-@end
+// RCTURLRequestHandlers
+#import <React/RCTDataRequestHandler.h>
+#import <React/RCTFileRequestHandler.h>
+#import <React/RCTHTTPRequestHandler.h>
 
 #if RCT_NEW_ARCH_ENABLED
-/// Declare conformance to `RCTComponentViewFactoryComponentProvider`
-@interface AppDelegate () <RCTComponentViewFactoryComponentProvider>
-@end
+#import <RNTMyNativeViewComponentView.h>
 #endif
 
-static NSString *const kRNConcurrentRoot = @"concurrentRoot";
-
 @implementation AppDelegate
 
-#ifdef RN_FABRIC_ENABLED
-- (instancetype)init
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
-  if (self = [super init]) {
-    _contextContainer = std::make_shared<facebook::react::ContextContainer const>();
-    _reactNativeConfig = std::make_shared<facebook::react::EmptyReactNativeConfig const>();
-    _contextContainer->insert("ReactNativeConfig", _reactNativeConfig);
-  }
-  return self;
-}
-#endif
-
-- (BOOL)application:(__unused UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
-{
-  RCTEnableTurboModule(YES);
-
-  _bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
+  self.moduleName = @"RNTesterApp";
+  // You can add your custom initial props in the dictionary below.
+  // They will be passed down to the ViewController used by React Native.
+  self.initialProps = [self prepareInitialProps];
 
-  // Appetizer.io params check
-  NSDictionary *initProps = [self prepareInitialProps];
-
-#if RCT_NEW_ARCH_ENABLED
-  [RCTComponentViewFactory currentComponentViewFactory].thirdPartyFabricComponentsProvider = self;
-#endif
-
-#ifdef RN_FABRIC_ENABLED
-  _bridgeAdapter = [[RCTSurfacePresenterBridgeAdapter alloc] initWithBridge:_bridge contextContainer:_contextContainer];
-
-  _bridge.surfacePresenter = _bridgeAdapter.surfacePresenter;
-
-  UIView *rootView = [[RCTFabricSurfaceHostingProxyRootView alloc] initWithBridge:_bridge
-                                                                       moduleName:@"RNTesterApp"
-                                                                initialProperties:initProps];
-
-  [self registerPaperComponents:@[ @"RNTMyLegacyNativeView" ]];
-#else
-  UIView *rootView = [[RCTRootView alloc] initWithBridge:_bridge moduleName:@"RNTesterApp" initialProperties:initProps];
-#endif
-
-  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
-  UIViewController *rootViewController = [UIViewController new];
-  rootViewController.view = rootView;
-  self.window.rootViewController = rootViewController;
-  [self.window makeKeyAndVisible];
-  [self initializeFlipper:application];
-
-  return YES;
-}
-
-- (BOOL)concurrentRootEnabled
-{
-  // Switch this bool to turn on and off the concurrent root
-  return true;
+  return [super application:application didFinishLaunchingWithOptions:launchOptions];
 }
 
 - (NSDictionary *)prepareInitialProps
@@ -164,33 +54,14 @@ - (NSDictionary *)prepareInitialProps
     initProps[@"exampleFromAppetizeParams"] = [NSString stringWithFormat:@"rntester://example/%@Example", _routeUri];
   }
 
-#ifdef RN_FABRIC_ENABLED
-  initProps[kRNConcurrentRoot] = @([self concurrentRootEnabled]);
-#endif
-
   return initProps;
 }
 
-- (NSURL *)sourceURLForBridge:(__unused RCTBridge *)bridge
+- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
 {
   return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"js/RNTesterApp.ios"];
 }
-
-- (void)initializeFlipper:(UIApplication *)application
-{
-#if DEBUG
-#ifdef FB_SONARKIT_ENABLED
-  FlipperClient *client = [FlipperClient sharedClient];
-  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
-  [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application
-                                                withDescriptorMapper:layoutDescriptorMapper]];
-  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
-  [client addPlugin:[FlipperKitReactPlugin new]];
-  [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
-  [client start];
-#endif
-#endif
-}
+//[self registerPaperComponents:@[ @"RNTMyLegacyNativeView" ]];
 
 - (BOOL)application:(UIApplication *)app
             openURL:(NSURL *)url
@@ -206,62 +77,6 @@ - (void)loadSourceForBridge:(RCTBridge *)bridge
   [RCTJavaScriptLoader loadBundleAtURL:[self sourceURLForBridge:bridge] onProgress:onProgress onComplete:loadCallback];
 }
 
-#pragma mark - RCTCxxBridgeDelegate
-
-// This function is called during
-// `[[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];`
-- (std::unique_ptr<facebook::react::JSExecutorFactory>)jsExecutorFactoryForBridge:(RCTBridge *)bridge
-{
-  std::shared_ptr<facebook::react::CallInvoker> callInvoker = bridge.jsCallInvoker;
-
-#ifdef RN_FABRIC_ENABLED
-  _runtimeScheduler = std::make_shared<facebook::react::RuntimeScheduler>(RCTRuntimeExecutorFromBridge(bridge));
-  _contextContainer->erase("RuntimeScheduler");
-  _contextContainer->insert("RuntimeScheduler", _runtimeScheduler);
-  callInvoker = std::make_shared<facebook::react::RuntimeSchedulerCallInvoker>(_runtimeScheduler);
-#endif
-
-  RCTTurboModuleManager *turboModuleManager = [[RCTTurboModuleManager alloc] initWithBridge:bridge
-                                                                                   delegate:self
-                                                                                  jsInvoker:callInvoker];
-  [bridge setRCTTurboModuleRegistry:turboModuleManager];
-
-#if RCT_DEV
-  /**
-   * Eagerly initialize RCTDevMenu so CMD + d, CMD + i, and CMD + r work.
-   * This is a stop gap until we have a system to eagerly init Turbo Modules.
-   */
-  [turboModuleManager moduleForName:"RCTDevMenu"];
-#endif
-
-  __weak __typeof(self) weakSelf = self;
-
-#if RCT_USE_HERMES
-  return std::make_unique<facebook::react::HermesExecutorFactory>(
-#else
-  return std::make_unique<facebook::react::JSCExecutorFactory>(
-#endif
-      facebook::react::RCTJSIExecutorRuntimeInstaller([weakSelf, bridge, turboModuleManager](
-                                                          facebook::jsi::Runtime &runtime) {
-        if (!bridge) {
-          return;
-        }
-
-#if RN_FABRIC_ENABLED
-        __typeof(self) strongSelf = weakSelf;
-        if (strongSelf && strongSelf->_runtimeScheduler) {
-          facebook::react::RuntimeSchedulerBinding::createAndInstallIfNeeded(runtime, strongSelf->_runtimeScheduler);
-        }
-#endif
-
-        facebook::react::RuntimeExecutor syncRuntimeExecutor =
-            [&](std::function<void(facebook::jsi::Runtime & runtime_)> &&callback) { callback(runtime); };
-        [turboModuleManager installJSBindingWithRuntimeExecutor:syncRuntimeExecutor];
-      }));
-}
-
-#pragma mark - RCTTurboModuleManagerDelegate
-
 - (Class)getModuleClassFromName:(const char *)name
 {
   return facebook::react::RNTesterTurboModuleClassProvider(name);
@@ -297,19 +112,6 @@ - (Class)getModuleClassFromName:(const char *)name
   return [moduleClass new];
 }
 
-#pragma mark - Interop layer
-
-- (void)registerPaperComponents:(NSArray<NSString *> *)components
-{
-#if RCT_NEW_ARCH_ENABLED
-  for (NSString *component in components) {
-    [RCTLegacyViewManagerInteropComponentView supportLegacyViewManagerWithName:component];
-  }
-#endif
-}
-
-#pragma mark - Push Notifications
-
 #if !TARGET_OS_TV && !TARGET_OS_UIKITFORMAC
 
 // Required to register for notifications
diff --git a/packages/rn-tester/react-native.config.js b/packages/rn-tester/react-native.config.js
index 099000c501058d..b3ad6adb66f61b 100644
--- a/packages/rn-tester/react-native.config.js
+++ b/packages/rn-tester/react-native.config.js
@@ -28,6 +28,7 @@ module.exports = {
   project: {
     ios: {
       sourceDir: '.',
+      unstable_reactLegacyComponentNames: ['RNTMyLegacyNativeView'],
     },
     android: {
       sourceDir: '../../',