diff --git a/build/libraries_sysmenu/hotsw/ARM7/include/hotswTypes.h b/build/libraries_sysmenu/hotsw/ARM7/include/hotswTypes.h
index d4aa97a8..18b14fd9 100644
--- a/build/libraries_sysmenu/hotsw/ARM7/include/hotswTypes.h
+++ b/build/libraries_sysmenu/hotsw/ARM7/include/hotswTypes.h
@@ -238,6 +238,7 @@ typedef enum HotSwState{
     HOTSW_MODE_ERROR,
     HOTSW_ILLEGAL_CARD_ERROR,
     HOTSW_GAMEMODE_ID_CHECK_ERROR,
+    HOTSW_BUS_LOCK_ERROR,
     HOTSW_UNEXPECTED_ERROR
 } HotSwState;
 
diff --git a/build/libraries_sysmenu/hotsw/ARM7/src/hotsw.c b/build/libraries_sysmenu/hotsw/ARM7/src/hotsw.c
index 9491f6f1..d4965fc9 100644
--- a/build/libraries_sysmenu/hotsw/ARM7/src/hotsw.c
+++ b/build/libraries_sysmenu/hotsw/ARM7/src/hotsw.c
@@ -927,6 +927,11 @@ static void ReadCardData(u32 src, u32 dest, u32 size)
     if(s_cbData.id_gam != s_gameID){
 		state = HOTSW_GAMEMODE_ID_CHECK_ERROR;
     }
+
+	// [Debug]
+    if(!(reg_MI_EXMEMCNT_L & REG_MI_EXMEMCNT_L_MP_MASK)){
+		state = HOTSW_BUS_LOCK_ERROR;
+    }
     
     while(size > 0 && state == HOTSW_SUCCESS){
         // --- Boot Segment
@@ -1025,6 +1030,10 @@ static void ReadCardData(u32 src, u32 dest, u32 size)
           case HOTSW_GAMEMODE_ID_CHECK_ERROR:
             retval = CARD_READ_ID_CHECK_ERROR;
             break;
+
+          case HOTSW_BUS_LOCK_ERROR:
+            retval = CARD_READ_BUS_LOCK_ERROR;
+            break;
             
           default:
             retval = CARD_READ_UNEXPECTED_ERROR;
diff --git a/include/sysmenu/sysmenu_lib/common/sysmenu_work.h b/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
index 06de63a9..f0f4e01c 100644
--- a/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
+++ b/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
@@ -44,6 +44,7 @@ typedef enum CardDataReadState {
     CARD_READ_MODE_ERROR,
     CARD_READ_BUSY,
     CARD_READ_ID_CHECK_ERROR,
+    CARD_READ_BUS_LOCK_ERROR,
     CARD_READ_UNEXPECTED_ERROR
 }
 CardDataReadState;