diff --git a/init/tunnel.py b/init/tunnel.py
index f5a6022..5d914ed 100644
--- a/init/tunnel.py
+++ b/init/tunnel.py
@@ -3,37 +3,72 @@
 import logging
 import subprocess
 import multiprocessing
+import queue as queue_module
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
 
+TUNNEL_START_TIMEOUT = 20
+RSD_PATTERNS = (
+    re.compile(r"--rsd (\S+) (\d+)"),
+    re.compile(r"^(\S+)\s+(\d+)$"),
+)
+
+
+def parse_rsd_output(output):
+    for pattern in RSD_PATTERNS:
+        match = pattern.search(output)
+        if match:
+            return match.group(1), int(match.group(2))
+    return None, None
+
+
+def build_tunnel_error(return_code, output_lines):
+    if output_lines:
+        recent_output = " | ".join(output_lines[-5:])
+        return f"start-tunnel exited before emitting an RSD address (exit code {return_code}). Recent output: {recent_output}"
+    return f"start-tunnel exited before emitting an RSD address (exit code {return_code})"
+
 def start_tunnel(queue):
-    command = [sys.executable, '-m', 'pymobiledevice3', 'lockdown', 'start-tunnel']
+    command = [sys.executable, '-m', 'pymobiledevice3', 'lockdown', 'start-tunnel', '--script-mode']
 
     process = subprocess.Popen(
         command,
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
-        text=True
+        text=True,
+        bufsize=1,
+        errors='replace'
     )
 
     logging.info("Tunnel started")
 
-    rsd_pattern = re.compile(r"--rsd (\S+) (\d+)")
-    address, port = None, None
+    if process.stdout is None:
+        queue.put(("error", "start-tunnel did not provide a readable output stream"))
+        return
+
+    output_lines = []
 
     while True:
-        output = process.stdout.readline().strip()
-        if output:
-            logging.info(output)
+        output = process.stdout.readline()
+        if output == "" and process.poll() is not None:
+            break
 
-        match = rsd_pattern.search(output)
-        if match:
-            address, port = match.group(1), int(match.group(2))
-            queue.put((address, port))
+        line = output.strip()
+        if not line:
+            continue
+
+        output_lines.append(line)
+        logging.info(line)
+
+        address, port = parse_rsd_output(line)
+        if address is not None:
+            queue.put(("ok", address, port))
             logging.info(f"RSD Address: {address}, RSD Port: {port}")
-            break
+            process.wait()
+            return
 
-    process.wait()
+    return_code = process.wait()
+    queue.put(("error", build_tunnel_error(return_code, output_lines)))
 
 def tunnel():
     queue = multiprocessing.Queue()
@@ -41,12 +76,21 @@ def tunnel():
     process.start()
     
     try:
-        result = queue.get(timeout=20)
+        result = queue.get(timeout=TUNNEL_START_TIMEOUT)
         if result is None:
-            raise RuntimeError("❌ 无法建立隧道连接")
-        address, port = result
+            raise RuntimeError("failed to establish tunnel connection")
+        status, *payload = result
+        if status != "ok":
+            raise RuntimeError(payload[0] if payload else "未知错误")
+
+        address, port = payload
         
         return process, address, port
+    except queue_module.Empty:
+        logging.error(
+            f"❌ 隧道建立失败: timed out after {TUNNEL_START_TIMEOUT}s waiting for an RSD address. "
+            "Ensure the terminal is running as administrator, the device is unlocked and trusted, and run pymobiledevice3 mounter auto-mount first"
+        )
     except Exception as e:
         logging.error(f"❌ 隧道建立失败: {e}")
         process.terminate()
@@ -54,4 +98,10 @@ def tunnel():
         if process.is_alive():
             process.kill()
 
+    if process.is_alive():
+        process.terminate()
+        process.join(timeout=2)
+        if process.is_alive():
+            process.kill()
+
     return None, None, None
diff --git a/main.py b/main.py
index 86bff17..69b688f 100644
--- a/main.py
+++ b/main.py
@@ -41,10 +41,15 @@ async def main():
     init.init()
     logger.info("init done")
 
+    process = None
     logger.info("trying to start tunnel")
     original_sigint_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
     process, address, port = tunnel.tunnel()
     signal.signal(signal.SIGINT, original_sigint_handler)
+
+    if process is None or address is None or port is None:
+        return
+
     try:
         logger.debug(f"tunnel address: {address}, port: {port}")
 
@@ -66,10 +71,12 @@ async def main():
     except KeyboardInterrupt:
         logger.debug("get KeyboardInterrupt (outer)")
     finally:
-        logger.debug(f"Is process alive? {process.is_alive()}")
-        logger.debug("terminating tunnel process")
-        process.terminate()
-        logger.info("tunnel process terminated")
+        if process is not None:
+            logger.debug(f"Is process alive? {process.is_alive()}")
+            if process.is_alive():
+                logger.debug("terminating tunnel process")
+                process.terminate()
+                logger.info("tunnel process terminated")
         print("Bye")