flash works when not in EXE

flash_tool/ESP32_WebFlasher_Windows.spec

@@ -3,14 +3,27 @@
 
 block_cipher = None
 
+import os
+import sys
+
+# Hardcode the venv esptool path since PyInstaller might run from different env
+esptool_dir = os.path.join(os.path.dirname(SPECPATH), 'venv', 'Lib', 'site-packages', 'esptool')
+
+# Build datas list - include all esptool data files
+datas_list = [
+    ('templates', 'templates'),
+    ('static', 'static'),
+]
+
+# Add esptool targets directory (includes stub_flasher JSON files)
+if os.path.exists(os.path.join(esptool_dir, 'targets')):
+    datas_list.append((os.path.join(esptool_dir, 'targets'), 'esptool/targets'))
+
 a = Analysis(
     ['web_flasher.py'],
     pathex=[],
     binaries=[],
-    datas=[
-        ('templates', 'templates'),
-        ('static', 'static'),
-    ],
+    datas=datas_list,
     hiddenimports=[
         'serial.tools.list_ports',
         'flask',
@@ -19,6 +32,10 @@ a = Analysis(
         'flask_socketio',
         'socketio',
         'engineio.async_drivers.threading',
+        'esptool',
+        'esptool.cmds',
+        'esptool.loader',
+        'esptool.util',
     ],
     hookspath=[],
     hooksconfig={},

flash_tool/templates/index.html

@@ -298,7 +298,7 @@
             <p class="subtitle">Firmware Flasher</p>
         </div>
 
-        <form id="flashForm">
+        <form id="flashForm" onsubmit="return false;">
             <div class="port-section">
                 <div class="form-group">
                     <label for="port">Serial Port</label>
@@ -444,6 +444,8 @@
 
         document.getElementById('flashForm').addEventListener('submit', async (e) => {
             e.preventDefault();
+            e.stopPropagation();
+            e.stopImmediatePropagation();
 
             const flashBtn = document.getElementById('flashBtn');
             const progressBar = document.getElementById('progressBar');