diff --git a/WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/FormISP_MSI.cs b/WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/FormISP_MSI.cs
index e17f7b8..aacfc56 100644
--- a/WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/FormISP_MSI.cs
+++ b/WIN10_WinISP_SrcCode_For_MOKA_20250416_1/WinISP/FormISP_MSI.cs
@@ -168,6 +168,7 @@ namespace WinISP
             }
 #endif
             TopMost = true;
+            btnAuto.Enabled = false;
             Connect();
             _lastNumOfMonitors = _numberOfMonitors;
             Application.Idle += Application_Idle;
@@ -486,6 +487,7 @@ namespace WinISP
                     frmISP.WriteLog("btnLoadFile_Click exception: " + ex.GetType().Name + ": " + ex.Message, "debug");
                     MessageBox.Show(this, "加载文件失败: " + ex.GetType().Name + "\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     SetStatusMsg("Could not read file from disk.", true);
+                    btnAuto.Enabled = false;
                 }
 
                 if (_binFilePath == String.Empty)
@@ -504,10 +506,12 @@ namespace WinISP
                     {
                         SetStatusMsg(verifyErr, true);
                         SetStatusMsg("Please select a F/W file.");
+                        btnAuto.Enabled = false;
                     }
                     else
                     {
                         SetStatusMsg("BIN loaded. Ready to upgrade.");
+                        btnAuto.Enabled = true;
                     }
                 }
             }
@@ -643,7 +647,7 @@ namespace WinISP
                 //if (IsConnect)
                 {
                     //WriteLog("IsConnect = true", "debug");
-                    btnAuto.Enabled = true;
+                    btnAuto.Enabled = !String.IsNullOrEmpty(_binFilePath);
                     if (String.IsNullOrEmpty(_binFilePath))
                         SetStatusMsg("Please select a F/W file.");
                     else
@@ -1623,7 +1627,7 @@ namespace WinISP
                 {
                     // BIN has a version but monitor version is unreadable – treat as mismatch.
                     frmISP.WriteLog("ValidateMonitorVsBin: effVer is empty, cannot verify FW version.", "debug");
-                    errMsg = "FWVersion not match" ;
+                    errMsg = "FW Version not match." ;
                     return false;
                 }
                 string normalizedMonVer = NormalizeFwVersionForCompare(effVer);
@@ -1631,7 +1635,7 @@ namespace WinISP
                 frmISP.WriteLog("ValidateMonitorVsBin: normalizedMonVer=" + normalizedMonVer + " normalizedBinVer=" + normalizedBinVer, "debug");
                 if (!string.Equals(normalizedMonVer, normalizedBinVer, StringComparison.OrdinalIgnoreCase))
                 {
-                    errMsg = "FWVersion not match";
+                    errMsg = "FW Version not match.";
                     return false;
                 }
             }
@@ -1692,6 +1696,7 @@ namespace WinISP
                     if (!ValidateMonitorVsBin(out checkErr))
                     {
                         SetStatusMsg(checkErr, true);
+                        btnAuto.Enabled = false;
                         return;
                     }
             prbProgress.Maximum = flashSectorInfo.Count;
@@ -1745,6 +1750,7 @@ namespace WinISP
             {
                 SetStatusMsg(verifyErr, true);
                 SetISPStatus(false);
+                btnAuto.Enabled = false;
                 return;
             }
 
@@ -2105,14 +2111,26 @@ namespace WinISP
                 System.IO.Directory.CreateDirectory(resultFolder);
 
             string path = resultFolder + (fileName == "" ? "" : fileName + "_") + DateTime.Now.ToString("yyyy-MM-dd") + ".log";
-            if (_logWriter == null || _logPath != path)
+            try
             {
-                if (_logWriter != null) { _logWriter.Flush(); _logWriter.Close(); }
-                _logPath = path;
-                _logWriter = new System.IO.StreamWriter(path, append: true);
+                if (_logWriter == null || _logPath != path)
+                {
+                    if (_logWriter != null)
+                    {
+                        _logWriter.Flush();
+                        _logWriter.Close();
+                    }
+                    _logPath = path;
+                    var stream = new FileStream(path, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
+                    _logWriter = new System.IO.StreamWriter(stream);
+                }
+                _logWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss.fff: ") + str);
+                _logWriter.Flush();
+            }
+            catch (IOException)
+            {
+                // Ignore logging failures caused by file locks.
             }
-            _logWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss.fff: ") + str);
-            _logWriter.Flush();
         }
 
         public static Byte[] InitBinaryFile(String filepath)