diff --git a/deps/cloudxr/webxr_client/helpers/LoadIWER.test.ts b/deps/cloudxr/webxr_client/helpers/LoadIWER.test.ts
index 847d013c36..d06add9069 100644
--- a/deps/cloudxr/webxr_client/helpers/LoadIWER.test.ts
+++ b/deps/cloudxr/webxr_client/helpers/LoadIWER.test.ts
@@ -48,6 +48,7 @@ describe('loadIWERIfNeeded', () => {
     } else {
       delete (navigator as Navigator & { xr?: XRSystem }).xr;
     }
+    delete testWindow.xrDevice;
     delete testWindow.IWER;
     delete testWindow.IWER_DevUI;
     jest.restoreAllMocks();
@@ -79,7 +80,9 @@ describe('loadIWERIfNeeded', () => {
 
     const device = {
       installDevUI: jest.fn(),
-      installRuntime: jest.fn(),
+      installRuntime: jest.fn(() => {
+        isSessionSupported.mockResolvedValue(true);
+      }),
     };
     testWindow.IWER = {
       XRDevice: jest.fn(() => device),
@@ -107,6 +110,38 @@ describe('loadIWERIfNeeded', () => {
     expect(appendChild).toHaveBeenCalledTimes(2);
   });
 
+  it('rejects a skipped runtime installation and allows a later retry', async () => {
+    const nativeXR = { isSessionSupported: jest.fn().mockResolvedValue(false) };
+    Object.defineProperty(navigator, 'xr', { configurable: true, value: nativeXR });
+    const device = { installRuntime: jest.fn() };
+    testWindow.IWER = { XRDevice: jest.fn(() => device), metaQuest3: {} };
+    jest.spyOn(document.head, 'appendChild').mockImplementation(<T extends Node>(node: T): T => {
+      if (node instanceof HTMLScriptElement) {
+        queueMicrotask(() => node.onload?.(new Event('load')));
+      }
+      return node;
+    });
+
+    await expect(loadIWERIfNeeded()).resolves.toEqual({
+      supportsImmersive: false,
+      iwerLoaded: false,
+    });
+    expect(window.xrDevice).toBeUndefined();
+    expect(navigator.xr).toBe(nativeXR);
+
+    device.installRuntime.mockImplementation(() => {
+      Object.defineProperty(navigator, 'xr', {
+        configurable: true,
+        value: { isSessionSupported: jest.fn().mockResolvedValue(true) },
+      });
+    });
+    await expect(loadIWERIfNeeded()).resolves.toEqual({
+      supportsImmersive: true,
+      iwerLoaded: true,
+    });
+    expect(window.xrDevice).toBe(device);
+  });
+
   it('shares one IWER installation across concurrent callers', async () => {
     let appendedScripts = 0;
     let constructedDevices = 0;
@@ -116,6 +151,10 @@ describe('loadIWERIfNeeded', () => {
       installDevUI: jest.fn(),
       installRuntime: jest.fn(() => {
         runtimeInstalls++;
+        Object.defineProperty(navigator, 'xr', {
+          configurable: true,
+          value: { isSessionSupported: jest.fn().mockResolvedValue(true) },
+        });
       }),
     };
     testWindow.IWER = {
diff --git a/deps/cloudxr/webxr_client/helpers/LoadIWER.ts b/deps/cloudxr/webxr_client/helpers/LoadIWER.ts
index a3fd119618..aba354de5d 100644
--- a/deps/cloudxr/webxr_client/helpers/LoadIWER.ts
+++ b/deps/cloudxr/webxr_client/helpers/LoadIWER.ts
@@ -24,8 +24,8 @@ declare global {
 }
 
 // Both versions are loaded from CDN; bump them together when upgrading IWER.
-const IWER_version = '2.3.0';
-const IWER_DEVUI_version = '2.3.0';
+const IWER_version = '2.7.0';
+const IWER_DEVUI_version = '2.7.0';
 let pendingIWERLoad: Promise<IWERLoadResult> | null = null;
 
 export interface IWERLoadResult {
@@ -65,7 +65,7 @@ async function loadIWER(): Promise<IWERLoadResult> {
     const script = document.createElement('script');
     script.src = `https://unpkg.com/iwer@${IWER_version}/build/iwer.min.js`;
     script.async = true;
-    script.integrity = 'sha384-m8Xcl9WwdP6j/5Fv7MAs7IvvW3PmWCbNZlbF8IsJAnujyeMZi0/xgUE4mM7Tbm/j';
+    script.integrity = 'sha384-pcGii0Tzet8SSL0v/VOhYIzm2dynTF4sEDPQxzsbepa8wICqZkNQvx3xuRRjj6Lc';
     script.crossOrigin = 'anonymous';
 
     await new Promise<void>(resolve => {
@@ -84,7 +84,7 @@ async function loadIWER(): Promise<IWERLoadResult> {
         devUIScript.src = `https://unpkg.com/@iwer/devui@${IWER_DEVUI_version}/build/iwer-devui.min.js`;
         devUIScript.async = true;
         devUIScript.integrity =
-          'sha384-TAu5gWlv92O6gkVclV8HYctTEswyA/0eoS6ULHjjLCShUVts4kDlUg6iLEKmL1r8';
+          'sha384-9jc9tp/DypE1hvhqLzE0xVpXYx64QqIRMDu6f3FkSIaeTqpwniy+t1ierx3y428X';
         devUIScript.crossOrigin = 'anonymous';
 
         await new Promise<void>(devUIResolve => {
@@ -110,17 +110,22 @@ async function loadIWER(): Promise<IWERLoadResult> {
             console.warn('IWER DevUI not found after script load, continuing without DevUI.');
           }
 
-          // This fallback runs only after the native XRSystem reports no immersive
-          // support. IWER 2.3 otherwise preserves that unusable navigator.xr.
+          // Only override the native runtime after it reports no immersive support.
           await device.installRuntime({ forceInstall: true });
-          window.xrDevice = device;
-          supportsImmersive = true;
-          iwerLoaded = true;
-          // The only log that's both unconditional (fires whether or not DevUI loaded, unlike
-          // "IWER DevUI initialized...") and guaranteed to follow installRuntime() actually
-          // succeeding (unlike "IWER DevUI initialized...", which logs before this await) - the
-          // one a caller (e.g. a test) should wait on to know navigator.xr is truly usable.
-          console.info('IWER runtime installed.');
+          // installRuntime can return without replacing navigator.xr; do not
+          // enable Connect until the installed runtime confirms session support.
+          const [vr, ar] = await Promise.all([
+            navigator.xr?.isSessionSupported('immersive-vr'),
+            navigator.xr?.isSessionSupported('immersive-ar'),
+          ]);
+          supportsImmersive = Boolean(vr || ar);
+          if (supportsImmersive) {
+            window.xrDevice = device;
+            iwerLoaded = true;
+            console.info('IWER runtime installed.');
+          } else {
+            console.warn('IWER runtime installed without immersive session support.');
+          }
         } catch (e) {
           console.warn('IWER runtime install failed:', e);
           supportsImmersive = false;
diff --git a/deps/cloudxr/webxr_client/package.json b/deps/cloudxr/webxr_client/package.json
index fff83564ee..3afbf6e1b2 100644
--- a/deps/cloudxr/webxr_client/package.json
+++ b/deps/cloudxr/webxr_client/package.json
@@ -83,7 +83,7 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "html-webpack-plugin": "^5.6.7",
-    "iwer": "^2.3.0",
+    "iwer": "^2.7.0",
     "jest": "^30",
     "jest-environment-jsdom": "^30.4.1",
     "prettier": "3.5.3",