diff --git a/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m b/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
index 0b5d0f0b1..b877f4f7c 100644
--- a/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
+++ b/WebDriverAgentLib/Categories/XCUIDevice+FBHelpers.m
@@ -123,7 +123,17 @@ - (BOOL)fb_lockScreen:(NSError **)error
   if (fb_isLocked) {
     return YES;
   }
-  [self pressLockButton];
+  if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"27.0")) {
+    // iOS 27: pressLockButton no longer locks; use a direct IOHID Power press (0x0C/0x30, ~0.5s hold).
+    if (![self fb_performIOHIDEventWithPage:0x0C
+                                      usage:0x30
+                                   duration:0.5
+                                      error:error]) {
+      return NO;
+    }
+  } else {
+    [self pressLockButton];
+  }
   return [[[[FBRunLoopSpinner new]
             timeout:FBScreenLockTimeout]
            timeoutErrorMessage:@"Timed out while waiting until the screen gets locked"]