diff --git a/scripts/artifacts-utils/ios/patched_ios_artifacts.rb b/scripts/artifacts-utils/ios/patched_ios_artifacts.rb
index d2ec5a6bae80..cd7eed3b8652 100644
--- a/scripts/artifacts-utils/ios/patched_ios_artifacts.rb
+++ b/scripts/artifacts-utils/ios/patched_ios_artifacts.rb
@@ -48,6 +48,43 @@ def self.setup
         ReactNativeCoreUtils.class_variable_set(:@@patched_artifact_url_prefix, resolution['artifactUrlPrefix'])
         ReactNativeCoreUtils.class_variable_set(:@@patched_github_token, resolution['githubToken'])
         ReactNativeCoreUtils.class_variable_set(:@@patched_build_from_source, resolution['buildFromSource'])
+
+        # Content identity of this install's artifacts; '+dsym' so flipping the flag counts as a change.
+        @artifacts_stamp = @using_prebuilt ?
+            "#{resolution['version']}#{ENV['RCT_SYMBOLICATE_PREBUILT_FRAMEWORKS'] == '1' ? '+dsym' : ''}" : nil
+
+        force_rncore_podspec_reevaluation if @using_prebuilt
+    end
+
+    def self.artifacts_stamp_path
+        File.join(Pod::Config.instance.project_pods_root, 'ReactNativeCore-artifacts', '.artifacts-version')
+    end
+
+    # CocoaPods memoizes external :podspec sources and may skip re-reading ours, whose source is
+    # resolved dynamically. When the tarballs in Pods don't match this install's resolution, drop
+    # the memoized copy so CocoaPods re-evaluates the podspec, re-running our download (and dSYM
+    # merge). The re-read podspec is byte-identical, so Podfile.lock stays put.
+    def self.force_rncore_podspec_reevaluation
+        return if File.exist?(artifacts_stamp_path) && File.read(artifacts_stamp_path) == @artifacts_stamp
+
+        Pod::Config.instance.sandbox.remove_local_podspec('React-Core-prebuilt')
+        log("Artifacts changed to #{@artifacts_stamp}; the React-Core-prebuilt podspec will be re-evaluated.")
+    end
+
+    # Prepends sync-prebuilt-rncore.sh to react-native's '[RNCore] Replace ...' build phase, so a
+    # build re-extracts the prebuilt React Core when the artifact version changed — CocoaPods won't,
+    # as its caches key on our never-changing source URL. Prepended into that phase (not added as
+    # its own) because CocoaPods sorts phases by name on save, which would push ours after [RNCore].
+    def self.add_sync_prebuilt_script_phase(installer)
+        return unless @using_prebuilt
+
+        target = installer.pods_project.targets.find { |t| t.name == 'React-Core-prebuilt' }
+        phase = target&.shell_script_build_phases&.find { |p| p.name.to_s.include?('[RNCore] Replace') }
+        raise "#{LOG_PREFIX} The [RNCore] Replace build phase was not found on the React-Core-prebuilt target, " \
+              'so the extracted prebuilt React Core would keep following a stale artifact version.' unless phase
+
+        prelude = %(bash "#{File.join(NEW_DOT_ROOT, 'scripts/artifacts-utils/ios/sync-prebuilt-rncore.sh')}" || exit 1\n)
+        phase.shell_script = prelude + phase.shell_script unless phase.shell_script.start_with?(prelude)
     end
 
     # True only when a matching prebuilt artifact resolved and prebuilds are enabled.
@@ -225,6 +262,10 @@ def self.podspec_source_download_prebuild_stable_tarball
             process_dsyms(release, download_stable_rncore(@@react_native_path, @@react_native_version, :release, true))
         end
 
+        # Content version of the flat tarballs — their names can't carry it, replace-rncore-version.js hardcodes them.
+        File.write(File.join(File.dirname(debug), '.artifacts-version'),
+                   "#{@@patched_version}#{@@download_dsyms ? '+dsym' : ''}")
+
         # URI::File.build validates path components as ASCII, so escape the filesystem path first —
         # matches RN 0.86's own ReactNativePodsUtils.local_file_uri, which this replaces.
         {:http => URI::File.build(path: URI::DEFAULT_PARSER.escape(debug)).to_s}
diff --git a/scripts/artifacts-utils/ios/sync-prebuilt-rncore.sh b/scripts/artifacts-utils/ios/sync-prebuilt-rncore.sh
new file mode 100755
index 000000000000..7b1002fb8f2b
--- /dev/null
+++ b/scripts/artifacts-utils/ios/sync-prebuilt-rncore.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+# Prelude of react-native's '[RNCore] Replace ...' build phase (prepended by
+# PatchedIOSArtifacts.add_sync_prebuilt_script_phase). When the extracted prebuilt React Core
+# is a different patched artifact version than the tarballs in Pods, invalidates the
+# .last_build_configuration marker so replace-rncore-version.js, running right after this,
+# re-extracts from the tarballs. Needed because our tarball path carries no patches version,
+# so a version change is invisible to CocoaPods and it can keep a stale extraction.
+#
+# Expected Xcode environment variables:
+#   PODS_ROOT
+set -euo pipefail
+
+TARBALLS_STAMP="$PODS_ROOT/ReactNativeCore-artifacts/.artifacts-version"
+PREBUILT_DIR="$PODS_ROOT/React-Core-prebuilt"
+readonly TARBALLS_STAMP PREBUILT_DIR
+
+# No stamp: the last install built react-native from source — nothing to sync.
+[ -f "$TARBALLS_STAMP" ] || exit 0
+
+TARBALLS=$(cat "$TARBALLS_STAMP")
+EXTRACTED=$(cat "$PREBUILT_DIR/.patched-version" 2>/dev/null || true)
+# Fast path, taken on every build: what is extracted matches the tarballs.
+[ "$TARBALLS" = "$EXTRACTED" ] && exit 0
+
+echo "[PatchedArtifacts] Extracted prebuilt React Core is '${EXTRACTED:-<none>}', tarballs are '$TARBALLS' — marking for re-extraction."
+mkdir -p "$PREBUILT_DIR"
+# 'stale' matches no configuration, so replace-rncore-version.js re-extracts; it stays until
+# an extraction succeeds and writes a real configuration back, so a failed build retries.
+# No trailing newlines: replace-rncore-version.js compares its marker verbatim.
+printf 'stale' > "$PREBUILT_DIR/.last_build_configuration"
+printf '%s' "$TARBALLS" > "$PREBUILT_DIR/.patched-version"