diff --git a/build/buildtools/commondefs.firm b/build/buildtools/commondefs.firm
index 6de8f38c..62ddcc21 100644
--- a/build/buildtools/commondefs.firm
+++ b/build/buildtools/commondefs.firm
@@ -18,6 +18,12 @@
 ifndef TWLFIRM_COMMONDEFS_
 TWLFIRM_COMMONDEFS_ = TRUE
 
+FIRM_FOR_CTR = TRUE
+
+ifdef FIRM_FOR_CTR
+MACRO_FLAGS	+= -DFIRM_FOR_CTR
+endif
+
 EMPTY	 	?=
 SPACE 		?= $(EMPTY) $(EMPTY)
 
@@ -28,7 +34,7 @@ TARGET_BIN		?=	$(TARGET_FIRM_BIN)
 #
 override TARGET_PLATFORM	:= TWL
 override TWL_ARCHGEN		:= LIMITED
-override TWL_CODEGEN		:= ARM
+override TWL_CODEGEN		:= THUMB
 override TWL_MEMSIZE		:= 16M
 
 #----------------------------------------------------------------------------
diff --git a/build/libraries/init/ARM7/crt0_firm.c b/build/libraries/init/ARM7/crt0_firm.c
index 9e881ca9..0712db4c 100644
--- a/build/libraries/init/ARM7/crt0_firm.c
+++ b/build/libraries/init/ARM7/crt0_firm.c
@@ -145,12 +145,16 @@ SDK_WEAK_SYMBOL asm void _start( void )
         mov             r0, #FIRM_PXI_ID_INIT_MMEM
         bl              PXIi_WaitIDByIntf
 
+#ifndef FIRM_FOR_CTR
+
         //---- clear HW_TWL_MAIN_MEM_SHARED
         mov             r0, #0
         ldr             r1, =HW_TWL_MAIN_MEM_SHARED
         mov             r2, #HW_TWL_MAIN_MEM_SHARED_SIZE
         bl              INITi_CpuClearFast
 
+#endif // FIRM_FOR_CTR
+
         //---- notify to clear HW_MAIN_MEM_SHARED
         mov             r0, #FIRM_PXI_ID_INIT_MMEM
         bl              PXIi_SendIDByIntf
diff --git a/build/nandfirm/menu-launcher/ARM7/main.c b/build/nandfirm/menu-launcher/ARM7/main.c
index 93249c37..2081e694 100644
--- a/build/nandfirm/menu-launcher/ARM7/main.c
+++ b/build/nandfirm/menu-launcher/ARM7/main.c
@@ -17,8 +17,6 @@
 #include <firm.h>
 #include <twl/mcu.h>
 
-#define FIRM_FOR_CTR
-
 /*
     PROFILE_ENABLE を定義するとある程度のパフォーマンスチェックができます。
     利用するためには、main.cかどこかに、u32 profile[256]; u32 pf_cnt = 0; を
@@ -231,6 +229,8 @@ void TwlSpMain( void )
 
 //    PM_BackLightOn( FALSE );
 
+#ifndef FIRM_FOR_CTR
+
     if ( !FS_LoadHeader( fd ) )
     {
         OS_TPrintf("Failed to call FS_LoadHeader().\n");
@@ -253,6 +253,8 @@ void TwlSpMain( void )
 
 //    PM_BackLightOn( FALSE );
 
+#endif // FIRM_FOR_CTR
+
     AESi_InitKeysFIRM();
     AESi_InitSeed();
     // 13: after AESi_InitSeed
diff --git a/build/nandfirm/menu-launcher/ARM9/main.c b/build/nandfirm/menu-launcher/ARM9/main.c
index fedc1c66..fcac527d 100644
--- a/build/nandfirm/menu-launcher/ARM9/main.c
+++ b/build/nandfirm/menu-launcher/ARM9/main.c
@@ -18,8 +18,6 @@
 #include <twl/lcfg.h>
 #include "print.h"
 
-#define FIRM_FOR_CTR
-
 #ifdef FIRM_USE_PRODUCT_KEYS
 #define RSA_KEY_ADDR    OSi_GetFromFirmAddr()->rsa_pubkey[0]    // 鍵管理.xls参照
 #else
@@ -333,6 +331,8 @@ void TwlMain( void )
     // 6: after PXI
     PUSH_PROFILE();
 
+#ifndef FIRM_FOR_CTR
+
     /* ES (CRYPTO) ライブラリはここまで */
     /* SVN_RSA はここから*/
     // RSA用ヒープ設定
@@ -351,8 +351,6 @@ void TwlMain( void )
     // 8: after PXI
     PUSH_PROFILE();
 
-#ifndef FIRM_FOR_CTR
-
     if ( !FS_LoadStatic( NULL ) )
     {
         OS_TPrintf("Failed to call FS_LoadStatic().\n");
@@ -362,6 +360,12 @@ void TwlMain( void )
     // 9: after FS_LoadStatic
     PUSH_PROFILE();
 
+#else // FIRM_FOR_CTR
+
+    MI_CpuCopyFast( (void*)HW_TWL_MAIN_MEM_SHARED, (void*)HW_ROM_HEADER_BUF, HW_ROM_HEADER_BUF_END - HW_ROM_HEADER_BUF );
+    MI_CpuCopyFast( (void*)HW_TWL_MAIN_MEM_SHARED, (void*)HW_TWL_ROM_HEADER_BUF, HW_TWL_ROM_HEADER_BUF_SIZE );
+    MI_CpuClearFast( (void*)HW_TWL_MAIN_MEM_SHARED, HW_TWL_ROM_HEADER_BUF_SIZE );
+
 #endif // FIRM_FOR_CTR
 
     PXI_NotifyID( FIRM_PXI_ID_DONE_STATIC );