diff --git a/build.gradle.kts b/build.gradle.kts
index 0858b5cb2917..05be0163c2c7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -137,15 +137,7 @@ if (project.findProperty("react.internal.useHermesStable")?.toString()?.toBoolea
     )
   }
 
-  val hermesV1Enabled = project.findProperty("hermesV1Enabled")?.toString()?.toBoolean() ?: true
-  // Hermes V1 stable releases are published without the -SNAPSHOT suffix.
-  // Legacy nightly builds use -SNAPSHOT.
-  val resolvedVersion =
-      if (hermesV1Enabled) hermesCompilerVersion else "$hermesCompilerVersion-SNAPSHOT"
-  val reason =
-      if (hermesV1Enabled) "Users opted to use hermes V1 stable"
-      else "Users opted to use hermes nightly"
-  hermesSubstitution = resolvedVersion to reason
+  hermesSubstitution = hermesCompilerVersion to "Users opted to use prebuilt hermes release"
 } else {
   logger.warn(
       """
diff --git a/gradle.properties b/gradle.properties
index d7c39175371a..4c1f11da8041 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -24,6 +24,3 @@ react.internal.useHermesStable=false
 # Controls whether to use Hermes from nightly builds. This will speed up builds
 # but should NOT be turned on for CI or release builds.
 react.internal.useHermesNightly=true
-
-# Controls whether to use Hermes 1.0. Clean and rebuild when changing.
-hermesV1Enabled=true
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
index e7859ff6ad0b..f3c0982c7e0f 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactPlugin.kt
@@ -28,8 +28,8 @@ import com.facebook.react.utils.DependencyUtils.readVersionAndGroupStrings
 import com.facebook.react.utils.JdkConfiguratorUtils.configureJavaToolChains
 import com.facebook.react.utils.JsonUtils
 import com.facebook.react.utils.NdkConfiguratorUtils.configureReactNativeNdk
-import com.facebook.react.utils.ProjectUtils.isHermesV1Enabled
 import com.facebook.react.utils.ProjectUtils.needsCodegenFromPackageJson
+import com.facebook.react.utils.PropertyUtils
 import com.facebook.react.utils.findPackageJsonFile
 import java.io.File
 import kotlin.system.exitProcess
@@ -55,8 +55,25 @@ class ReactPlugin : Plugin<Project> {
                 project,
             )
 
-    if (!project.rootProject.isHermesV1Enabled) {
-      rootExtension.hermesV1Enabled.set(false)
+    // Warn users if they still have the hermesV1Enabled property set.
+    if (
+        project.rootProject.hasProperty(PropertyUtils.HERMES_V1_ENABLED) ||
+            project.rootProject.hasProperty(PropertyUtils.SCOPED_HERMES_V1_ENABLED)
+    ) {
+      val value =
+          (project.rootProject.findProperty(PropertyUtils.HERMES_V1_ENABLED)
+                  ?: project.rootProject.findProperty(PropertyUtils.SCOPED_HERMES_V1_ENABLED))
+              .toString()
+              .toBoolean()
+      if (value) {
+        project.logger.warn(
+            "WARNING: The 'hermesV1Enabled' property is no longer needed. Hermes V1 is now always enabled. You can safely remove this property from your gradle.properties."
+        )
+      } else {
+        project.logger.warn(
+            "WARNING: Opting out of Hermes V1 is no longer supported. The 'hermesV1Enabled=false' property will be ignored. Hermes V1 is now always enabled. Please remove this property from your gradle.properties."
+        )
+      }
     }
 
     // App Only Configuration
@@ -75,8 +92,7 @@ class ReactPlugin : Plugin<Project> {
             File(reactNativeDir, "sdks/hermes-engine/version.properties")
         val versionAndGroupStrings =
             readVersionAndGroupStrings(project, propertiesFile, hermesVersionPropertiesFile)
-        val hermesV1Enabled = rootExtension.hermesV1Enabled.get()
-        configureDependencies(project, versionAndGroupStrings, hermesV1Enabled)
+        configureDependencies(project, versionAndGroupStrings)
         configureRepositories(project, versionAndGroupStrings.isNightly)
       }
 
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/internal/PrivateReactExtension.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/internal/PrivateReactExtension.kt
index 26174c0ce0de..2ba7668b4e1b 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/internal/PrivateReactExtension.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/internal/PrivateReactExtension.kt
@@ -59,5 +59,4 @@ abstract class PrivateReactExtension @Inject constructor(project: Project) {
   val codegenDir: DirectoryProperty =
       objects.directoryProperty().convention(root.dir("node_modules/@react-native/codegen"))
 
-  val hermesV1Enabled: Property<Boolean> = objects.property(Boolean::class.java).convention(true)
 }
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/DependencyUtils.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/DependencyUtils.kt
index c5f42cfdb43d..d1a41c5278d5 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/DependencyUtils.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/DependencyUtils.kt
@@ -119,14 +119,8 @@ internal object DependencyUtils {
   fun configureDependencies(
       project: Project,
       coordinates: Coordinates,
-      hermesV1Enabled: Boolean = true,
   ) {
-    if (
-        coordinates.versionString.isBlank() ||
-            (!hermesV1Enabled && coordinates.hermesVersionString.isBlank()) ||
-            (hermesV1Enabled && coordinates.hermesV1VersionString.isBlank())
-    )
-        return
+    if (coordinates.versionString.isBlank() || coordinates.hermesV1VersionString.isBlank()) return
     project.rootProject.allprojects { eachProject ->
       eachProject.configurations.all { configuration ->
         // Here we set a dependencySubstitution for both react-native and hermes-engine as those
@@ -134,8 +128,7 @@ internal object DependencyUtils {
         // This allows users to import libraries that are still using
         // implementation("com.facebook.react:react-native:+") and resolve the right dependency.
         configuration.resolutionStrategy.dependencySubstitution {
-          getDependencySubstitutions(coordinates, hermesV1Enabled).forEach { (module, dest, reason)
-            ->
+          getDependencySubstitutions(coordinates).forEach { (module, dest, reason) ->
             it.substitute(it.module(module)).using(it.module(dest)).because(reason)
           }
         }
@@ -146,7 +139,7 @@ internal object DependencyUtils {
           // Contributors only: The hermes-engine version is forced only if the user has
           // not opted into using nightlies for local development.
           configuration.resolutionStrategy.force(
-              "${coordinates.hermesGroupString}:hermes-android:${if (hermesV1Enabled) coordinates.hermesV1VersionString else coordinates.hermesVersionString}"
+              "${coordinates.hermesGroupString}:hermes-android:${coordinates.hermesV1VersionString}"
           )
         }
       }
@@ -155,12 +148,10 @@ internal object DependencyUtils {
 
   internal fun getDependencySubstitutions(
       coordinates: Coordinates,
-      hermesV1Enabled: Boolean = true,
   ): List<Triple<String, String, String>> {
     val dependencySubstitution = mutableListOf<Triple<String, String, String>>()
-    val hermesVersion =
-        if (hermesV1Enabled) coordinates.hermesV1VersionString else coordinates.hermesVersionString
-    val hermesVersionString = "${coordinates.hermesGroupString}:hermes-android:${hermesVersion}"
+    val hermesVersionString =
+        "${coordinates.hermesGroupString}:hermes-android:${coordinates.hermesV1VersionString}"
     dependencySubstitution.add(
         Triple(
             "com.facebook.react:react-native",
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/ProjectUtils.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/ProjectUtils.kt
index 805b9f92dd57..2c3bdb97ae1f 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/ProjectUtils.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/ProjectUtils.kt
@@ -13,11 +13,9 @@ import com.facebook.react.utils.KotlinStdlibCompatUtils.lowercaseCompat
 import com.facebook.react.utils.KotlinStdlibCompatUtils.toBooleanStrictOrNullCompat
 import com.facebook.react.utils.PropertyUtils.EDGE_TO_EDGE_ENABLED
 import com.facebook.react.utils.PropertyUtils.HERMES_ENABLED
-import com.facebook.react.utils.PropertyUtils.HERMES_V1_ENABLED
 import com.facebook.react.utils.PropertyUtils.REACT_NATIVE_ARCHITECTURES
 import com.facebook.react.utils.PropertyUtils.SCOPED_EDGE_TO_EDGE_ENABLED
 import com.facebook.react.utils.PropertyUtils.SCOPED_HERMES_ENABLED
-import com.facebook.react.utils.PropertyUtils.SCOPED_HERMES_V1_ENABLED
 import com.facebook.react.utils.PropertyUtils.SCOPED_REACT_NATIVE_ARCHITECTURES
 import com.facebook.react.utils.PropertyUtils.SCOPED_USE_THIRD_PARTY_JSC
 import com.facebook.react.utils.PropertyUtils.USE_THIRD_PARTY_JSC
@@ -29,7 +27,6 @@ internal object ProjectUtils {
 
   const val HERMES_FALLBACK = true
 
-  const val HERMES_V1_ENABLED_FALLBACK = true
 
   internal fun Project.isNewArchEnabled(): Boolean = true
 
@@ -73,23 +70,6 @@ internal object ProjectUtils {
             (project.hasProperty(SCOPED_USE_THIRD_PARTY_JSC) &&
                 project.property(SCOPED_USE_THIRD_PARTY_JSC).toString().toBoolean())
 
-  internal val Project.isHermesV1Enabled: Boolean
-    get() =
-        if (
-            project.hasProperty(HERMES_V1_ENABLED) || project.hasProperty(SCOPED_HERMES_V1_ENABLED)
-        ) {
-          (project.hasProperty(HERMES_V1_ENABLED) &&
-              project.property(HERMES_V1_ENABLED).toString().toBoolean()) ||
-              (project.hasProperty(SCOPED_HERMES_V1_ENABLED) &&
-                  project.property(SCOPED_HERMES_V1_ENABLED).toString().toBoolean()) ||
-              (project.extraProperties.has(HERMES_V1_ENABLED) &&
-                  project.extraProperties.get(HERMES_V1_ENABLED).toString().toBoolean()) ||
-              (project.extraProperties.has(SCOPED_HERMES_V1_ENABLED) &&
-                  project.extraProperties.get(SCOPED_HERMES_V1_ENABLED).toString().toBoolean())
-        } else {
-          HERMES_V1_ENABLED_FALLBACK
-        }
-
   internal fun Project.needsCodegenFromPackageJson(rootProperty: DirectoryProperty): Boolean {
     val parsedPackageJson = readPackageJsonFile(this, rootProperty)
     return needsCodegenFromPackageJson(parsedPackageJson)
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/DependencyUtilsTest.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/DependencyUtilsTest.kt
index 0454b5ece333..e0da26317c8a 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/DependencyUtilsTest.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/DependencyUtilsTest.kt
@@ -297,7 +297,7 @@ class DependencyUtilsTest {
   }
 
   @Test
-  fun configureDependencies_withVersionString_appliesResolutionStrategy_withClassicHermes() {
+  fun configureDependencies_withVersionString_appliesResolutionStrategy() {
     val project = createProject()
 
     configureDependencies(project, DependencyUtils.Coordinates("1.2.3", "4.5.6", "7.8.9"))
@@ -305,31 +305,12 @@ class DependencyUtilsTest {
     val forcedModules = project.configurations.first().resolutionStrategy.forcedModules
     assertThat(forcedModules.any { it.toString() == "com.facebook.react:react-android:1.2.3" })
         .isTrue()
-    assertThat(forcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:4.5.6" })
-        .isFalse()
     assertThat(forcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:7.8.9" })
         .isTrue()
   }
 
   @Test
-  fun configureDependencies_withVersionString_appliesResolutionStrategy_withHermesV1() {
-    val project = createProject()
-
-    configureDependencies(
-        project,
-        DependencyUtils.Coordinates("1.2.3", "4.5.6", "7.8.9"),
-        hermesV1Enabled = true,
-    )
-
-    val forcedModules = project.configurations.first().resolutionStrategy.forcedModules
-    assertThat(forcedModules.any { it.toString() == "com.facebook.react:react-android:1.2.3" })
-        .isTrue()
-    assertThat(forcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:7.8.9" })
-        .isTrue()
-  }
-
-  @Test
-  fun configureDependencies_withVersionString_appliesOnAllProjects_withClassicHermes() {
+  fun configureDependencies_withVersionString_appliesOnAllProjects() {
     val rootProject = ProjectBuilder.builder().build()
     val appProject = ProjectBuilder.builder().withName("app").withParent(rootProject).build()
     val libProject = ProjectBuilder.builder().withName("lib").withParent(rootProject).build()
@@ -338,36 +319,6 @@ class DependencyUtilsTest {
 
     configureDependencies(appProject, DependencyUtils.Coordinates("1.2.3", "4.5.6", "7.8.9"))
 
-    val appForcedModules = appProject.configurations.first().resolutionStrategy.forcedModules
-    val libForcedModules = libProject.configurations.first().resolutionStrategy.forcedModules
-    assertThat(appForcedModules.any { it.toString() == "com.facebook.react:react-android:1.2.3" })
-        .isTrue()
-    assertThat(appForcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:4.5.6" })
-        .isFalse()
-    assertThat(appForcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:7.8.9" })
-        .isTrue()
-    assertThat(libForcedModules.any { it.toString() == "com.facebook.react:react-android:1.2.3" })
-        .isTrue()
-    assertThat(libForcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:4.5.6" })
-        .isFalse()
-    assertThat(libForcedModules.any { it.toString() == "com.facebook.hermes:hermes-android:7.8.9" })
-        .isTrue()
-  }
-
-  @Test
-  fun configureDependencies_withVersionString_appliesOnAllProjects_withHermesV1() {
-    val rootProject = ProjectBuilder.builder().build()
-    val appProject = ProjectBuilder.builder().withName("app").withParent(rootProject).build()
-    val libProject = ProjectBuilder.builder().withName("lib").withParent(rootProject).build()
-    appProject.plugins.apply("com.android.application")
-    libProject.plugins.apply("com.android.library")
-
-    configureDependencies(
-        appProject,
-        DependencyUtils.Coordinates("1.2.3", "4.5.6", "7.8.9"),
-        hermesV1Enabled = true,
-    )
-
     val appForcedModules = appProject.configurations.first().resolutionStrategy.forcedModules
     val libForcedModules = libProject.configurations.first().resolutionStrategy.forcedModules
     assertThat(appForcedModules.any { it.toString() == "com.facebook.react:react-android:1.2.3" })
@@ -381,50 +332,7 @@ class DependencyUtilsTest {
   }
 
   @Test
-  fun configureDependencies_withVersionStringAndGroupString_appliesOnAllProjects_withClassicHermes() {
-    val rootProject = ProjectBuilder.builder().build()
-    val appProject = ProjectBuilder.builder().withName("app").withParent(rootProject).build()
-    val libProject = ProjectBuilder.builder().withName("lib").withParent(rootProject).build()
-    appProject.plugins.apply("com.android.application")
-    libProject.plugins.apply("com.android.library")
-
-    configureDependencies(
-        appProject,
-        DependencyUtils.Coordinates(
-            "1.2.3",
-            "4.5.6",
-            "7.8.9",
-            "io.github.test",
-            "io.github.test.hermes",
-        ),
-    )
-
-    val appForcedModules = appProject.configurations.first().resolutionStrategy.forcedModules
-    val libForcedModules = libProject.configurations.first().resolutionStrategy.forcedModules
-    assertThat(appForcedModules.any { it.toString() == "io.github.test:react-android:1.2.3" })
-        .isTrue()
-    assertThat(
-            appForcedModules.any { it.toString() == "io.github.test.hermes:hermes-android:4.5.6" }
-        )
-        .isFalse()
-    assertThat(
-            appForcedModules.any { it.toString() == "io.github.test.hermes:hermes-android:7.8.9" }
-        )
-        .isTrue()
-    assertThat(libForcedModules.any { it.toString() == "io.github.test:react-android:1.2.3" })
-        .isTrue()
-    assertThat(
-            libForcedModules.any { it.toString() == "io.github.test.hermes:hermes-android:4.5.6" }
-        )
-        .isFalse()
-    assertThat(
-            libForcedModules.any { it.toString() == "io.github.test.hermes:hermes-android:7.8.9" }
-        )
-        .isTrue()
-  }
-
-  @Test
-  fun configureDependencies_withVersionStringAndGroupString_appliesOnAllProjects_withHermesV1() {
+  fun configureDependencies_withVersionStringAndGroupString_appliesOnAllProjects() {
     val rootProject = ProjectBuilder.builder().build()
     val appProject = ProjectBuilder.builder().withName("app").withParent(rootProject).build()
     val libProject = ProjectBuilder.builder().withName("lib").withParent(rootProject).build()
@@ -440,7 +348,6 @@ class DependencyUtilsTest {
             "io.github.test",
             "io.github.test.hermes",
         ),
-        hermesV1Enabled = true,
     )
 
     val appForcedModules = appProject.configurations.first().resolutionStrategy.forcedModules
@@ -460,7 +367,7 @@ class DependencyUtilsTest {
   }
 
   @Test
-  fun getDependencySubstitutions_withDefaultGroup_substitutesCorrectly_withHermesV1() {
+  fun getDependencySubstitutions_withDefaultGroup_substitutesCorrectly() {
     val dependencySubstitutions =
         getDependencySubstitutions(DependencyUtils.Coordinates("0.42.0", "0.42.0", "0.43.0"))
 
@@ -481,31 +388,7 @@ class DependencyUtilsTest {
   }
 
   @Test
-  fun getDependencySubstitutions_withDefaultGroupAndFallback_substitutesCorrectly_withClassicHermes() {
-    val dependencySubstitutions =
-        getDependencySubstitutions(
-            DependencyUtils.Coordinates("0.42.0", "0.42.0", "0.43.0"),
-            hermesV1Enabled = true,
-        )
-
-    assertThat("com.facebook.react:react-native").isEqualTo(dependencySubstitutions[0].first)
-    assertThat("com.facebook.react:react-android:0.42.0")
-        .isEqualTo(dependencySubstitutions[0].second)
-    assertThat(
-            "The react-native artifact was deprecated in favor of react-android due to https://github.com/facebook/react-native/issues/35210."
-        )
-        .isEqualTo(dependencySubstitutions[0].third)
-    assertThat("com.facebook.react:hermes-engine").isEqualTo(dependencySubstitutions[1].first)
-    assertThat("com.facebook.hermes:hermes-android:0.43.0")
-        .isEqualTo(dependencySubstitutions[1].second)
-    assertThat(
-            "The hermes-engine artifact was deprecated in favor of hermes-android due to https://github.com/facebook/react-native/issues/35210."
-        )
-        .isEqualTo(dependencySubstitutions[1].third)
-  }
-
-  @Test
-  fun getDependencySubstitutions_withCustomGroup_substitutesCorrectly_withHermesV1() {
+  fun getDependencySubstitutions_withCustomGroup_substitutesCorrectly() {
     val dependencySubstitutions =
         getDependencySubstitutions(
             DependencyUtils.Coordinates(
@@ -546,49 +429,6 @@ class DependencyUtilsTest {
         .isEqualTo(dependencySubstitutions[4].third)
   }
 
-  @Test
-  fun getDependencySubstitutions_withCustomGroupAndFallbackToClassicHermes_substitutesCorrectly_withClassicHermes() {
-    val dependencySubstitutions =
-        getDependencySubstitutions(
-            DependencyUtils.Coordinates(
-                "0.42.0",
-                "0.42.0",
-                "0.43.0",
-                "io.github.test",
-                "io.github.test.hermes",
-            ),
-            hermesV1Enabled = false,
-        )
-
-    assertThat("com.facebook.react:react-native").isEqualTo(dependencySubstitutions[0].first)
-    assertThat("io.github.test:react-android:0.42.0").isEqualTo(dependencySubstitutions[0].second)
-    assertThat(
-            "The react-native artifact was deprecated in favor of react-android due to https://github.com/facebook/react-native/issues/35210."
-        )
-        .isEqualTo(dependencySubstitutions[0].third)
-    assertThat("com.facebook.react:hermes-engine").isEqualTo(dependencySubstitutions[1].first)
-    assertThat("io.github.test.hermes:hermes-android:0.42.0")
-        .isEqualTo(dependencySubstitutions[1].second)
-    assertThat(
-            "The hermes-engine artifact was deprecated in favor of hermes-android due to https://github.com/facebook/react-native/issues/35210."
-        )
-        .isEqualTo(dependencySubstitutions[1].third)
-    assertThat("com.facebook.react:hermes-android").isEqualTo(dependencySubstitutions[2].first)
-    assertThat("io.github.test.hermes:hermes-android:0.42.0")
-        .isEqualTo(dependencySubstitutions[2].second)
-    assertThat("The hermes-android artifact was moved to com.facebook.hermes publishing group.")
-        .isEqualTo(dependencySubstitutions[2].third)
-    assertThat("com.facebook.react:react-android").isEqualTo(dependencySubstitutions[3].first)
-    assertThat("io.github.test:react-android:0.42.0").isEqualTo(dependencySubstitutions[3].second)
-    assertThat("The react-android dependency was modified to use the correct Maven group.")
-        .isEqualTo(dependencySubstitutions[3].third)
-    assertThat("com.facebook.react:hermes-android").isEqualTo(dependencySubstitutions[4].first)
-    assertThat("io.github.test.hermes:hermes-android:0.42.0")
-        .isEqualTo(dependencySubstitutions[4].second)
-    assertThat("The hermes-android dependency was modified to use the correct Maven group.")
-        .isEqualTo(dependencySubstitutions[4].third)
-  }
-
   @Test
   fun readVersionString_withCorrectVersionString_returnsIt() {
     val propertiesFile =
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/ProjectUtilsTest.kt b/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/ProjectUtilsTest.kt
index f4ec2a40acf7..54a3016e9616 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/ProjectUtilsTest.kt
+++ b/packages/gradle-plugin/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/ProjectUtilsTest.kt
@@ -14,7 +14,6 @@ import com.facebook.react.tests.createProject
 import com.facebook.react.utils.ProjectUtils.getReactNativeArchitectures
 import com.facebook.react.utils.ProjectUtils.isEdgeToEdgeEnabled
 import com.facebook.react.utils.ProjectUtils.isHermesEnabled
-import com.facebook.react.utils.ProjectUtils.isHermesV1Enabled
 import com.facebook.react.utils.ProjectUtils.isNewArchEnabled
 import com.facebook.react.utils.ProjectUtils.needsCodegenFromPackageJson
 import java.io.File
@@ -116,32 +115,6 @@ class ProjectUtilsTest {
     assertThat(project.isEdgeToEdgeEnabled).isFalse()
   }
 
-  @Test
-  fun isHermesV1Enabled_returnsTrueByDefault() {
-    assertThat(createProject().isHermesV1Enabled).isTrue()
-  }
-
-  @Test
-  fun isHermesV1Enabled_withDisabledViaProperty_returnsFalse() {
-    val project = createProject()
-    project.extensions.extraProperties.set("hermesV1Enabled", "false")
-    assertThat(project.isHermesV1Enabled).isFalse()
-  }
-
-  @Test
-  fun isHermesV1Enabled_withEnabledViaProperty_returnsTrue() {
-    val project = createProject()
-    project.extensions.extraProperties.set("hermesV1Enabled", "true")
-    assertThat(project.isHermesV1Enabled).isTrue()
-  }
-
-  @Test
-  fun isHermesV1Enabled_withInvalidViaProperty_returnsFalse() {
-    val project = createProject()
-    project.extensions.extraProperties.set("hermesV1Enabled", "¯\\_(ツ)_/¯")
-    assertThat(project.isHermesV1Enabled).isFalse()
-  }
-
   @Test
   fun needsCodegenFromPackageJson_withCodegenConfigInPackageJson_returnsTrue() {
     val project = createProject()
diff --git a/packages/react-native/ReactAndroid/build.gradle.kts b/packages/react-native/ReactAndroid/build.gradle.kts
index 99e05410f8c1..304b5343e60a 100644
--- a/packages/react-native/ReactAndroid/build.gradle.kts
+++ b/packages/react-native/ReactAndroid/build.gradle.kts
@@ -39,9 +39,6 @@ val downloadsDir =
 val thirdPartyNdkDir = File("$buildDir/third-party-ndk")
 val reactNativeRootDir = projectDir.parent
 
-val hermesV1Enabled =
-    rootProject.extensions.getByType(PrivateReactExtension::class.java).hermesV1Enabled.get()
-
 // We put the publishing version from gradle.properties inside ext. so other
 // subprojects can access it as well.
 extra["publishing_version"] = project.findProperty("VERSION_NAME")?.toString()!!
@@ -583,9 +580,7 @@ android {
             "-DCMAKE_POLICY_DEFAULT_CMP0069=NEW",
         )
 
-        if (hermesV1Enabled) {
-          arguments("-DHERMES_V1_ENABLED=1")
-        }
+        arguments("-DHERMES_V1_ENABLED=1")
 
         targets(
             "reactnative",
diff --git a/packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts b/packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts
index faf4e4f9d1ff..669b301a4302 100644
--- a/packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts
+++ b/packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts
@@ -5,7 +5,6 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import com.facebook.react.internal.PrivateReactExtension
 import com.facebook.react.tasks.internal.*
 import de.undercouch.gradle.tasks.download.Download
 import org.apache.tools.ant.taskdefs.condition.Os
@@ -50,8 +49,6 @@ fun getSDKManagerPath(): String {
   }
 }
 
-val hermesV1Enabled =
-    rootProject.extensions.getByType(PrivateReactExtension::class.java).hermesV1Enabled.get()
 val reactNativeRootDir = project(":packages:react-native:ReactAndroid").projectDir.parent
 val customDownloadDir = System.getenv("REACT_NATIVE_DOWNLOADS_DIR")
 val downloadsDir =
@@ -82,12 +79,8 @@ val hermesBuildOutputFileTree =
         .include("**/*.cmake", "**/*.marks", "**/compiler_depends.ts", "**/Makefile", "**/link.txt")
 
 val hermesVersionProvider: Provider<String> = providers.provider {
-  var hermesVersion = if (hermesV1Enabled) "250829098.0.0-stable" else "main"
-  val hermesVersionFile =
-      File(
-          reactNativeRootDir,
-          if (hermesV1Enabled) "sdks/.hermesv1version" else "sdks/.hermesversion",
-      )
+  var hermesVersion = "250829098.0.0-stable"
+  val hermesVersionFile = File(reactNativeRootDir, "sdks/.hermesv1version")
 
   if (hermesVersionFile.exists()) {
     hermesVersion = hermesVersionFile.readText()
@@ -172,9 +165,7 @@ fun configureBuildForHermesCommandLineArgs(
   if (Os.isFamily(Os.FAMILY_WINDOWS)) {
     cmakeCommandLine = cmakeCommandLine + "-GNMake Makefiles"
   }
-  if (hermesV1Enabled) {
-    cmakeCommandLine = cmakeCommandLine + "-DHERMESVM_HEAP_HV_MODE=HEAP_HV_PREFER32"
-  }
+  cmakeCommandLine = cmakeCommandLine + "-DHERMESVM_HEAP_HV_MODE=HEAP_HV_PREFER32"
 
   return cmakeCommandLine
 }
@@ -358,9 +349,7 @@ android {
             "-DHERMES_ENABLE_INTL=True",
         )
 
-        if (hermesV1Enabled) {
-          arguments("-DHERMESVM_HEAP_HV_MODE=HEAP_HV_PREFER32")
-        }
+        arguments("-DHERMESVM_HEAP_HV_MODE=HEAP_HV_PREFER32")
 
         targets("hermesvm")
       }
diff --git a/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt b/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
index 01742cce7f07..7fb0a1184782 100644
--- a/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
+++ b/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt
@@ -22,7 +22,7 @@ file(TO_CMAKE_PATH "${REACT_ANDROID_DIR}" REACT_ANDROID_DIR)
 file(TO_CMAKE_PATH "${REACT_BUILD_DIR}" REACT_BUILD_DIR)
 file(TO_CMAKE_PATH "${REACT_COMMON_DIR}" REACT_COMMON_DIR)
 
-set(HERMES_V1_ENABLED OFF CACHE BOOL "Build with support for Hermes v1")
+set(HERMES_V1_ENABLED ON CACHE BOOL "Build with support for Hermes v1")
 
 # If you have ccache installed, we're going to honor it.
 find_program(CCACHE_FOUND ccache)
diff --git a/packages/react-native/ReactCommon/cmake-utils/react-native-flags.cmake b/packages/react-native/ReactCommon/cmake-utils/react-native-flags.cmake
index b8a420af216d..160e9da55d8f 100644
--- a/packages/react-native/ReactCommon/cmake-utils/react-native-flags.cmake
+++ b/packages/react-native/ReactCommon/cmake-utils/react-native-flags.cmake
@@ -32,7 +32,5 @@ function(target_compile_reactnative_options target_name scope)
   if(ANDROID)
     target_compile_definitions(${target_name} ${scope} RN_SERIALIZABLE_STATE)
   endif()
-  if(HERMES_V1_ENABLED)
-    target_compile_definitions(${target_name} ${scope} HERMES_V1_ENABLED=1)
-  endif()
+  target_compile_definitions(${target_name} ${scope} HERMES_V1_ENABLED=1)
 endfunction()
diff --git a/packages/react-native/settings.gradle.kts b/packages/react-native/settings.gradle.kts
index 62527f0149f2..a5c8e053d9fd 100644
--- a/packages/react-native/settings.gradle.kts
+++ b/packages/react-native/settings.gradle.kts
@@ -39,45 +39,3 @@ project(":packages").projectDir = file("/tmp")
 
 project(":packages:react-native").projectDir = file("/tmp")
 
-// Gradle properties defined in `gradle.properties` are not inherited by
-// included builds, see https://github.com/gradle/gradle/issues/2534.
-// This is a workaround to read the configuration from the consuming project,
-// and apply relevant properties to the :react-native project.
-buildscript {
-  val properties = java.util.Properties()
-  val propertiesToInherit = listOf("hermesV1Enabled", "react.hermesV1Enabled")
-
-  // We cannot assume that the node_modules are next to the android project, for example
-  // in monorepos, they might get hoisted.
-  // In a composite build, this included build can access the invoking (consumer) build
-  // via `gradle.parent`. We use its StartParameter to locate the app's `gradle.properties`:
-  // - `projectDir/gradle.properties` when Gradle is run with `-p <androidDir>`
-  // - `currentDir/gradle.properties` when run from the app android folder
-  // If neither exists, we keep the legacy RN fallback path below.
-
-  val parentGradle = gradle.parent
-  val parentProjectDir = parentGradle?.startParameter?.projectDir
-  val parentCurrentDir = parentGradle?.startParameter?.currentDir
-  val gradlePropertiesCandidates =
-      listOfNotNull(
-          parentProjectDir?.resolve("gradle.properties"),
-          parentCurrentDir?.resolve("gradle.properties"),
-          // Backward-compatible fallback for classic RN app layouts.
-          file("../../android/gradle.properties"),
-      )
-
-  try {
-    val propertiesFile = gradlePropertiesCandidates.firstOrNull { it.exists() }
-    propertiesFile?.inputStream()?.use { properties.load(it) }
-
-    gradle.rootProject {
-      propertiesToInherit.forEach { property ->
-        if (properties.containsKey(property)) {
-          gradle.rootProject.extra.set(property, properties.getProperty(property))
-        }
-      }
-    }
-  } catch (e: Exception) {
-    // fail silently
-  }
-}
diff --git a/private/react-native-fantom/build.gradle.kts b/private/react-native-fantom/build.gradle.kts
index 55d6a92d9dff..f23992c64692 100644
--- a/private/react-native-fantom/build.gradle.kts
+++ b/private/react-native-fantom/build.gradle.kts
@@ -6,7 +6,6 @@
  */
 
 import com.android.build.gradle.internal.tasks.factory.dependsOn
-import com.facebook.react.internal.PrivateReactExtension
 import com.facebook.react.tasks.internal.*
 import com.facebook.react.tasks.internal.utils.*
 import de.undercouch.gradle.tasks.download.Download
@@ -16,9 +15,6 @@ plugins {
   alias(libs.plugins.download)
 }
 
-val hermesV1Enabled =
-    rootProject.extensions.getByType(PrivateReactExtension::class.java).hermesV1Enabled.get()
-
 // This is the version of CMake we're requesting to the Android SDK to use.
 // If missing it will be downloaded automatically. Only CMake versions shipped with the
 // Android SDK are supported (you can find them listed in the SDK Manager of Android Studio).
@@ -203,9 +199,7 @@ val configureFantomTester by
               "-DRN_ENABLE_DEBUG_STRING_CONVERTIBLE=ON",
           )
 
-      if (hermesV1Enabled) {
-        cmdArgs.add("-DHERMES_V1_ENABLED=1")
-      }
+      cmdArgs.add("-DHERMES_V1_ENABLED=1")
 
       commandLine(cmdArgs)
       standardOutputFile.set(project.file("$buildDir/reports/configure-fantom_tester.log"))