diff --git a/run-windows11.py b/run-windows11.py
index a106a31..f693d8c 100755
--- a/run-windows11.py
+++ b/run-windows11.py
@@ -486,6 +486,32 @@ print("Account: guofang / password; " + "; ".join(
     f"{forward.label}: 0.0.0.0:{forward.host_port}" for forward in forwards),
     flush=True)
 
+if installing_from_iso and not install_from_img:
+    # The Windows ISO boots through bootmgr, which waits for a key ("Press any
+    # key to boot from CD or DVD...") and gives up after a few seconds. Nobody
+    # is there to press it, so a detached helper taps the space bar through the
+    # QEMU monitor for the first 30 s. It exits by itself; later key presses
+    # are harmless because Setup is unattended.
+    key_script = (
+        "import socket, sys, time\n"
+        "path = sys.argv[1]\n"
+        "end = time.time() + 30\n"
+        "while time.time() < end:\n"
+        "    try:\n"
+        "        s = socket.socket(socket.AF_UNIX)\n"
+        "        s.connect(path)\n"
+        "        break\n"
+        "    except OSError:\n"
+        "        time.sleep(0.5)\n"
+        "else:\n"
+        "    sys.exit(0)\n"
+        "while time.time() < end:\n"
+        "    s.sendall(b'sendkey spc\\n')\n"
+        "    time.sleep(1)\n")
+    subprocess.Popen([sys.executable, "-c", key_script, str(monitor_socket)],
+                     stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
+                     stderr=subprocess.DEVNULL, start_new_session=True)
+
 if daemonize:
     log_file.write_text("")
     qemu_args += ["-serial", f"file:{log_file}", "-daemonize", "-pidfile", str(pid_file)]
diff --git a/vm-images b/vm-images
index 71c0c3d..1dc4065 160000
--- a/vm-images
+++ b/vm-images
@@ -1 +1 @@
-Subproject commit 71c0c3d029f1366b7c5faa4f5f078210abe5f5b9
+Subproject commit 1dc40655dffcc07ca34907b6d36063d8dbe7d279