diff --git a/INT69DC_7C/Forms/FormMain.cs b/INT69DC_7C/Forms/FormMain.cs
index ea4e4a2..a88f8fe 100644
--- a/INT69DC_7C/Forms/FormMain.cs
+++ b/INT69DC_7C/Forms/FormMain.cs
@@ -515,7 +515,7 @@ namespace INT69DC_7C.Forms
 
 
             // DllSerial 사용여부 설정
-            this.FlagDllSerial = true;
+            this.FlagDllSerial = false;
             if (this.FlagDllSerial == true)
             {
                 // SerialDll Initialize
diff --git a/INT69DC_7C/Version.txt b/INT69DC_7C/Version.txt
index 9a1220f..0c83485 100644
--- a/INT69DC_7C/Version.txt
+++ b/INT69DC_7C/Version.txt
@@ -24,9 +24,10 @@
 */
 
 @ Ver 12.3.1 by CJY
-	- 2025.07.07
+	- 2025.08.21
 	- Ver 12.3.0 Modify
 	- Framework : SmartX Framework V3.2.4(update: 2021.01.20)
+	- SerialDll ¹Ì»ç¿ë
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 	- (¹ö±×¼öÁ¤) Password°¡ label - *·Î Ç¥½ÃµÇ¾î »ý±â´Â ¹ö±× ¼öÁ¤