diff --git a/build_windows.bat b/build_windows.bat
index 978e142..d4c1b1a 100644
--- a/build_windows.bat
+++ b/build_windows.bat
@@ -11,6 +11,10 @@ echo.
 
 cd /d "%~dp0"
 
+REM Doc version tu file
+set /p APP_VERSION=<version.txt
+echo Building version: v%APP_VERSION%
+
 REM 1. Tao venv neu chua co
 if not exist "venv" (
     echo [1/4] Creating virtual environment...
@@ -27,9 +31,10 @@ pip install -r requirements.txt pyinstaller --quiet
 REM 4. Build .exe
 echo [3/4] Building executable...
 pyinstaller ^
-    --name "Mira_Firmware_Loader_v1.1.0" ^
+    --name "Mira_Firmware_Loader_v%APP_VERSION%" ^
     --icon "icon.ico" ^
     --add-data "icon.ico;." ^
+    --add-data "version.txt;." ^
     --onefile ^
     --windowed ^
     --noconfirm ^
@@ -47,11 +52,11 @@ echo.
 echo [4/4] Build complete!
 echo.
 
-if exist "dist\Mira_Firmware_Loader_v1.1.0.exe" (
-    echo SUCCESS: dist\Mira_Firmware_Loader_v1.1.0.exe
+if exist "dist\Mira_Firmware_Loader_v%APP_VERSION%.exe" (
+    echo SUCCESS: dist\Mira_Firmware_Loader_v%APP_VERSION%.exe
     echo.
     echo File size:
-    for %%A in ("dist\Mira_Firmware_Loader_v1.1.0.exe") do echo    %%~zA bytes
+    for %%A in ("dist\Mira_Firmware_Loader_v%APP_VERSION%.exe") do echo    %%~zA bytes
     echo.
     echo Ban co the copy file .exe nay sang may khac va chay truc tiep.
 ) else (
diff --git a/core/scanner.py b/core/scanner.py
index bb4db0f..d871680 100644
--- a/core/scanner.py
+++ b/core/scanner.py
@@ -74,7 +74,7 @@ def _ping_sweep(network, progress_cb=None):
         if progress_cb:
             progress_cb(done_count[0], total)
 
-    with ThreadPoolExecutor(max_workers=70) as executor:
+    with ThreadPoolExecutor(max_workers=100) as executor:
         futures = [executor.submit(_ping_and_track, ip) for ip in hosts]
         for f in as_completed(futures):
             pass
diff --git a/main.py b/main.py
index 662f0a0..86a7c0d 100644
--- a/main.py
+++ b/main.py
@@ -28,7 +28,7 @@ from core.ssh_flasher import flash_device_ssh
 from core.workers import ScanThread, FlashThread
 
 from utils.network import _resolve_hostname, get_default_network
-from utils.system import resource_path, get_machine_info
+from utils.system import resource_path, get_machine_info, get_version
 
 
 
@@ -72,7 +72,7 @@ class App(QWidget):
         title.setAlignment(Qt.AlignmentFlag.AlignCenter)
         layout.addWidget(title)
 
-        copyright_label = QLabel(f"© {datetime.datetime.now().year} Smatec — R&D Software Team. v1.1.0")
+        copyright_label = QLabel(f"© {datetime.datetime.now().year} Smatec — R&D Software Team. v{get_version()}")
         copyright_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
         copyright_label.setStyleSheet(
             "color: #9399b2; font-size: 11px; font-weight: 500; font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto;"
@@ -337,12 +337,12 @@ class App(QWidget):
         parallel_row.addStretch()
         flash_layout.addLayout(parallel_row)
 
-        btn_flash = QPushButton("⚡ FLASH SELECTED DEVICES")
-        btn_flash.setObjectName("flash")
-        btn_flash.setMinimumHeight(45)
-        btn_flash.setStyleSheet("QPushButton#flash { font-size: 16px; font-weight: bold; letter-spacing: 1px; }")
-        btn_flash.clicked.connect(self.flash_all)
-        flash_layout.addWidget(btn_flash)
+        self.btn_flash = QPushButton("⚡ FLASH SELECTED DEVICES")
+        self.btn_flash.setObjectName("flash")
+        self.btn_flash.setMinimumHeight(45)
+        self.btn_flash.setStyleSheet("QPushButton#flash { font-size: 16px; font-weight: bold; letter-spacing: 1px; }")
+        self.btn_flash.clicked.connect(self.flash_all)
+        flash_layout.addWidget(self.btn_flash)
 
         flash_group.setLayout(flash_layout)
         layout.addWidget(flash_group)
@@ -657,6 +657,9 @@ class App(QWidget):
         self.flash_thread.device_status.connect(self._on_flash_status)
         self.flash_thread.device_done.connect(self._on_flash_done)
         self.flash_thread.all_done.connect(self._on_flash_all_done)
+        
+        # Disable flash button during flashing
+        self.btn_flash.setEnabled(False)
         self.flash_thread.start()
 
     def _on_flash_status(self, index, msg):
@@ -690,6 +693,7 @@ class App(QWidget):
 
     def _on_flash_all_done(self):
         """All flashing complete."""
+        self.btn_flash.setEnabled(True)
         QMessageBox.information(self, "Flash Complete", "All devices have been processed.")
 
 
diff --git a/utils/system.py b/utils/system.py
index 28a2880..8a19104 100644
--- a/utils/system.py
+++ b/utils/system.py
@@ -34,3 +34,11 @@ def get_machine_info():
         "os": os_info,
         "mac": mac_addr,
     }
+
+def get_version():
+    """Read version from version.txt"""
+    try:
+        with open(resource_path('version.txt'), 'r', encoding='utf-8') as f:
+            return f.read().strip()
+    except Exception:
+        return "Unknown"
diff --git a/version.txt b/version.txt
new file mode 100644
index 0000000..524cb55
--- /dev/null
+++ b/version.txt
@@ -0,0 +1 @@
+1.1.1