Refactor: Update build scripts and improve Telnet handling in SSH flasher

core/ssh_flasher.py

@@ -30,7 +30,40 @@ def _create_ssh_client(ip, user, password, timeout=15):
             time.sleep(1)
 
 
-import telnetlib
+import socket
+
+
+class _SimpleTelnet:
+    """Minimal Telnet client using raw sockets (replaces telnetlib removed in Python 3.13+)."""
+    def __init__(self, host, port=23, timeout=10):
+        self._sock = socket.create_connection((host, port), timeout=timeout)
+
+    def read_very_eager(self):
+        try:
+            self._sock.setblocking(False)
+            data = b""
+            while True:
+                try:
+                    chunk = self._sock.recv(4096)
+                    if not chunk:
+                        break
+                    data += chunk
+                except (BlockingIOError, OSError):
+                    break
+            self._sock.setblocking(True)
+            return data
+        except Exception:
+            return b""
+
+    def write(self, data):
+        self._sock.sendall(data)
+
+    def close(self):
+        try:
+            self._sock.close()
+        except Exception:
+            pass
+
 
 def set_device_password(ip, user="root", old_password="", new_password="admin123a",
                         status_cb=None):
@@ -45,7 +78,7 @@ def set_device_password(ip, user="root", old_password="", new_password="admin123
 
     # 1. Thử Telnet trước (OpenWrt mặc định mở Telnet 23 và cấm SSH Root khi chưa có Pass)
     try:
-        tn = telnetlib.Telnet(ip, timeout=5)
+        tn = _SimpleTelnet(ip, timeout=5)
         # Nếu vô được Telnet tức là thiết bị vừa Reset cứng chưa có pass
         if status_cb:
             status_cb("Telnet connected! Setting password...")