diff --git a/pytest-embedded-serial-esp/pytest_embedded_serial_esp/serial.py b/pytest-embedded-serial-esp/pytest_embedded_serial_esp/serial.py
index 007b81b7..17fdf437 100644
--- a/pytest-embedded-serial-esp/pytest_embedded_serial_esp/serial.py
+++ b/pytest-embedded-serial-esp/pytest_embedded_serial_esp/serial.py
@@ -13,6 +13,7 @@ class EspSerial(Serial):
 
     Attributes:
         esp: esptool.ESPLoader, will auto upload stub.
+        stub: esptool.ESPStubLoader, stubbed loader.
     """
 
     DEFAULT_BAUDRATE = 115200
@@ -58,7 +59,7 @@ def __init__(
                 raise ValueError('Couldn\'t auto detect chip. Please manually specify with "--port"')
 
             # stub loader has more functionalities, need to run after calling `run_stub()`
-            self.stub: esptool.ESPLoader = None  # type: ignore
+            self.stub: esptool.ESPLoader = self.esp.run_stub()
 
             if baud > initial_baud:
                 self.esp.change_baud(baud)  # change back to the users settings
@@ -78,29 +79,21 @@ def _post_init(self):
 
     def use_esptool(func):
         """
-        1. close the port and open the port to kill the `self._forward_io` thread
-        2. call `run_stub()`
-        3. call to the decorated function, could use `self.stub` as the stubbed loader
-        4. call `hard_reset()`
-        5. create the `self.forward_io` thread again.
+        1. call to the decorated function, could use `self.stub` as the stubbed loader
+        2. call `hard_reset()`
+        3. create the `self.forward_io` thread again.
         """
 
         @functools.wraps(func)
         def wrapper(self, *args, **kwargs):
-            self.proc.close()
-            self.proc.open()
-
             settings = self.proc.get_settings()
 
             try:
                 with DuplicateStdout(self.pexpect_proc):
-                    self.esp.connect('hard_reset')
-                    self.stub = self.esp.run_stub()
                     ret = func(self, *args, **kwargs)
                     self.stub.hard_reset()
             finally:
                 self.proc.apply_settings(settings)
-                self.create_forward_io_thread(self.pexpect_proc)
 
             return ret