diff --git a/mobile/ios/Runner/IosNavigationBar.swift b/mobile/ios/Runner/IosNavigationBar.swift
index 7a036785f0..7d7dc8294a 100644
--- a/mobile/ios/Runner/IosNavigationBar.swift
+++ b/mobile/ios/Runner/IosNavigationBar.swift
@@ -1,6 +1,9 @@
 import Flutter
 import UIKit
 
+// UIKit 9127.0.85 is the iOS 27.1 SDK with Duo APIs. SDK checks must
+// surround runtime availability checks: older SDKs cannot resolve these symbols.
+
 /// Each Flutter route owns a UIKit navigation controller. Its private scroll
 /// view mirrors the Flutter viewport so UIKit performs the large-title layout.
 final class IosNavigationBarFactory: NSObject, FlutterPlatformViewFactory {
@@ -316,6 +319,7 @@ private final class IosNavigationBarView: NSObject, FlutterPlatformView {
       result(nil)
     }
     configure(args as? [String: Any] ?? [:])
+    #if canImport(UIKit, _version: 9127.0.85)
     if #available(iOS 27.1, *), standaloneControl {
       container.addInteraction(UIHingeInteraction { [weak self] _, _ in
         guard let self else { return }
@@ -327,6 +331,7 @@ private final class IosNavigationBarView: NSObject, FlutterPlatformView {
         DispatchQueue.main.asyncAfter(deadline: .now() + 1.2, execute: refresh)
       })
     }
+    #endif
   }
 
   func view() -> UIView { container }
@@ -421,6 +426,7 @@ private final class IosNavigationBarView: NSObject, FlutterPlatformView {
   }
 
   private func reportRailGeometry() {
+    #if canImport(UIKit, _version: 9127.0.85)
     guard #available(iOS 27.1, *), let window = container.window else { return }
     let inset = window.safeAreaInsets
     let right = inset.right > 0 && inset.left == 0
@@ -458,6 +464,7 @@ private final class IosNavigationBarView: NSObject, FlutterPlatformView {
     DispatchQueue.main.async { [weak self] in
       self?.channel.invokeMethod("railGeometry", arguments: values)
     }
+    #endif
   }
 
   private func reportAvatarBounds() {
@@ -872,9 +879,11 @@ private final class IosNavigationBarView: NSObject, FlutterPlatformView {
       stack.bottomAnchor.constraint(equalTo: surface.contentView.bottomAnchor)
     ])
     let item = UIBarButtonItem(customView: surface)
+    #if canImport(UIKit, _version: 9127.0.85)
     if #available(iOS 27.1, *), actions.allSatisfy({ $0["keepInHeaderOnDuo"] as? Bool == true }) {
       item.axisBehavior = .horizontalOnly
     }
+    #endif
     if #available(iOS 26.0, *) { item.hidesSharedBackground = true }
     return item
   }
diff --git a/mobile/ios/Runner/NativeProfileTextEditor.swift b/mobile/ios/Runner/NativeProfileTextEditor.swift
index 4a8fd38da2..419118a033 100644
--- a/mobile/ios/Runner/NativeProfileTextEditor.swift
+++ b/mobile/ios/Runner/NativeProfileTextEditor.swift
@@ -1,6 +1,9 @@
 import Flutter
 import UIKit
 
+// UIKit 9127.0.85 is the iOS 27.1 SDK with Duo APIs. SDK checks must
+// surround runtime availability checks: older SDKs cannot resolve these symbols.
+
 final class NativeProfileTextEditorCoordinator: NSObject,
   UIAdaptivePresentationControllerDelegate
 {
@@ -207,11 +210,13 @@ final class NativeProfileTextEditorCoordinator: NSObject,
 
   @MainActor
   private func configureDuoPlacement(_ navigation: UINavigationController, presenter: UIViewController) {
+    #if canImport(UIKit, _version: 9127.0.85)
     guard #available(iOS 27.1, *) else { return }
     let insets = presenter.view.safeAreaInsets
     guard insets.top == 0, insets.left > 0 || insets.right > 0 else { return }
     navigation.sheetPresentationController?.preferredPlacement =
       presenter.view.effectiveUserInterfaceLayoutDirection == .rightToLeft ? .leading : .trailing
+    #endif
   }
 
   @MainActor
@@ -432,10 +437,12 @@ final class NativeProfileTextEditorViewController:
       navigationItem.rightBarButtonItem?.image = UIImage(systemName: "checkmark")
       navigationItem.rightBarButtonItem?.accessibilityLabel = "Create"
     }
+    #if canImport(UIKit, _version: 9127.0.85)
     if #available(iOS 27.1, *) {
       navigationItem.leftBarButtonItem?.axisBehavior = .verticalPreferred
       navigationItem.rightBarButtonItem?.axisBehavior = .verticalPreferred
     }
+    #endif
     updateNavigation()
   }
 
diff --git a/mobile/ios/Runner/NativeStatusEditor.swift b/mobile/ios/Runner/NativeStatusEditor.swift
index f1d1a71cf5..64b5793b83 100644
--- a/mobile/ios/Runner/NativeStatusEditor.swift
+++ b/mobile/ios/Runner/NativeStatusEditor.swift
@@ -1,5 +1,8 @@
 import UIKit
 
+// UIKit 9127.0.85 is the iOS 27.1 SDK with Duo APIs. SDK checks must
+// surround runtime availability checks: older SDKs cannot resolve these symbols.
+
 /// Status uses the same navigation-controller sheet as the profile text forms.
 final class NativeStatusEditorViewController: UITableViewController, UITextFieldDelegate {
   let statusField = UITextField()
@@ -48,10 +51,12 @@ final class NativeStatusEditorViewController: UITableViewController, UITextField
     navigationItem.leftBarButtonItem?.accessibilityLabel = "Close"
     navigationItem.rightBarButtonItem = UIBarButtonItem(
       title: "Set", style: .done, target: self, action: #selector(save))
+    #if canImport(UIKit, _version: 9127.0.85)
     if #available(iOS 27.1, *) {
       navigationItem.leftBarButtonItem?.axisBehavior = .verticalPreferred
       navigationItem.rightBarButtonItem?.axisBehavior = .verticalPreferred
     }
+    #endif
     statusField.text = configuration["text"] as? String ?? ""
     statusField.placeholder = "What’s your status?"
     statusField.accessibilityLabel = "Status"
diff --git a/mobile/ios/RunnerTests/ProfileSetupRecoveryTests.swift b/mobile/ios/RunnerTests/ProfileSetupRecoveryTests.swift
index 4e20ee397b..805f3aca81 100644
--- a/mobile/ios/RunnerTests/ProfileSetupRecoveryTests.swift
+++ b/mobile/ios/RunnerTests/ProfileSetupRecoveryTests.swift
@@ -7,7 +7,6 @@ import XCTest
 final class ProfileSetupRecoveryTests: XCTestCase {
   @MainActor
   func testNativeEditorsPreferRightPaneOnlyWithDuoRail() async throws {
-    guard #available(iOS 27.1, *) else { return }
     for duo in [false, true] {
       for method in ["presentStatus", "present"] {
         let messenger = ProfileSetupTestMessenger()
@@ -26,7 +25,12 @@ final class ProfileSetupRecoveryTests: XCTestCase {
           DispatchQueue.main.async { continuation.resume() }
         }
         let sheet = try XCTUnwrap(parent.captured?.sheetPresentationController)
-        XCTAssertEqual(sheet.preferredPlacement, duo ? .trailing : .automatic)
+        #if canImport(UIKit, _version: 9127.0.85)
+        if #available(iOS 27.1, *) {
+          XCTAssertEqual(sheet.preferredPlacement, duo ? .trailing : .automatic)
+        }
+        #endif
+        XCTAssertEqual(sheet.detents.map(\.identifier), [.large])
         XCTAssertNil(sheet.sourceView)
       }
     }
@@ -56,10 +60,12 @@ final class ProfileSetupRecoveryTests: XCTestCase {
     let submit = try XCTUnwrap(editor.navigationItem.rightBarButtonItem)
     XCTAssertEqual(cancel.accessibilityLabel, "Close")
     XCTAssertFalse(submit.isEnabled)
+    #if canImport(UIKit, _version: 9127.0.85)
     if #available(iOS 27.1, *) {
       XCTAssertEqual(cancel.axisBehavior, .verticalPreferred)
       XCTAssertEqual(submit.axisBehavior, .verticalPreferred)
     }
+    #endif
     XCTAssertEqual(editor.tableView(editor.tableView, numberOfRowsInSection: 1), 2)
     editor.tableView(editor.tableView, didSelectRowAt: IndexPath(row: 0, section: 2))
     XCTAssertTrue(submit.isEnabled)
@@ -94,10 +100,12 @@ final class ProfileSetupRecoveryTests: XCTestCase {
       editor.loadViewIfNeeded()
       let cancel = try XCTUnwrap(editor.navigationItem.leftBarButtonItem)
       let submit = try XCTUnwrap(editor.navigationItem.rightBarButtonItem)
+      #if canImport(UIKit, _version: 9127.0.85)
       if #available(iOS 27.1, *) {
         XCTAssertEqual(cancel.axisBehavior, .verticalPreferred)
         XCTAssertEqual(submit.axisBehavior, .verticalPreferred)
       }
+      #endif
       XCTAssertTrue(cancel.isEnabled)
       XCTAssertFalse(submit.isEnabled)
       UIApplication.shared.sendAction(try XCTUnwrap(cancel.action), to: cancel.target, from: cancel, for: nil)
diff --git a/mobile/ios/RunnerTests/RunnerTests.swift b/mobile/ios/RunnerTests/RunnerTests.swift
index aafb7073a0..0f314ea8c2 100644
--- a/mobile/ios/RunnerTests/RunnerTests.swift
+++ b/mobile/ios/RunnerTests/RunnerTests.swift
@@ -659,7 +659,6 @@ class RunnerTests: XCTestCase {
 
   @MainActor
   func testStandaloneRailObservesBookPosture() throws {
-    guard #available(iOS 27.1, *) else { return }
     for standalone in [false, true] {
       let parent = UIViewController()
       let bar = IosNavigationBarFactory(
@@ -667,8 +666,16 @@ class RunnerTests: XCTestCase {
       ).create(withFrame: CGRect(x: 0, y: 0, width: 48, height: 48),
                viewIdentifier: 999989,
                arguments: ["standaloneControl": standalone])
-      XCTAssertEqual(
-        bar.view().interactions.contains { $0 is UIHingeInteraction }, standalone)
+      #if canImport(UIKit, _version: 9127.0.85)
+      if #available(iOS 27.1, *) {
+        XCTAssertEqual(
+          bar.view().interactions.contains { $0 is UIHingeInteraction }, standalone)
+      } else {
+        XCTAssertTrue(bar.view().interactions.isEmpty)
+      }
+      #else
+      XCTAssertTrue(bar.view().interactions.isEmpty)
+      #endif
     }
   }
 
diff --git a/scripts/test-mobile-me-agent-accessibility.sh b/scripts/test-mobile-me-agent-accessibility.sh
index 6fd75eb013..49dfa0ec22 100755
--- a/scripts/test-mobile-me-agent-accessibility.sh
+++ b/scripts/test-mobile-me-agent-accessibility.sh
@@ -9,6 +9,7 @@ fixture=$(mktemp -d)
 trap 'rm -r "$fixture"' EXIT
 # Compile in one file to exercise the private production controller directly.
 cat "$repo_root/mobile/ios/Runner/MeAvatarLoader.swift" \
+  "$repo_root/mobile/ios/Runner/NativeStatusEditor.swift" \
   "$repo_root/mobile/ios/Runner/NativeProfileTextEditor.swift" \
   "$repo_root/mobile/ios/NativeControlTests/MeAgentAccessibilityTests.swift" > "$fixture/test.swift"
 xcrun --sdk iphonesimulator swiftc -parse-as-library \