diff --git a/source/arm11/cheat.c b/source/arm11/cheat.c
index c435c40..c7abce6 100644
--- a/source/arm11/cheat.c
+++ b/source/arm11/cheat.c
@@ -7,16 +7,13 @@
 
 typedef u32 instruction_t;
 typedef instruction_t* CodeLocation;
+#define INSTR_SIZE  sizeof(instruction_t)
+#define INSTR_LEN(memsize)   ((memsize)/INSTR_SIZE)
 #define CodeAtLocation(p) (*(p))
 
 #define MAKE_ENT(hole,key)  (((key)<<16) | (hole))
 #define ENT_KEY(id)         ((id)>>16)
 #define ENT_HOLE(id)        ((id)&0xffff)
-#define ROM_LOC             ((CodeLocation)0x20000000u)
-#define GBA_KEYCODE(k)      (0x3ff & (~(k)))
-
-#define SIZE_32M (32*1024*1024)
-#define MAX_HOOKPOINT 10
 
 typedef struct {
     u32  chtId;             // acl_chtid_t
@@ -106,8 +103,17 @@ cheat_error_t fini_current_cheat()
 //  code for patch rom with cheat instruction
 // *******************************************
 
+#define FIT_SPACE_RESERVED 80
+#define ROM_LOC             ((CodeLocation)0x20000000u)
+
 #define GBACPU_PREFETCH  2
-#define GBACPU_PREFETCH_BYTE (sizeof(instruction_t)*GBACPU_PREFETCH)
+#define GBACPU_PREFETCH_BYTE (INSTR_SIZE*GBACPU_PREFETCH)
+
+#define GBA_KEYCODE(k)      (0x3ff & (~(k)))
+#define GBA_CART_ADDR       (0x8000000u)
+
+#define SIZE_32M (32*1024*1024)
+#define MAX_HOOKPOINT 10
 
 const instruction_t HOOKPOINT_INSTR[] = {
     0xe92d8000, // STMDB sp!, {pc}
@@ -116,7 +122,7 @@ const instruction_t HOOKPOINT_INSTR[] = {
 };
 
 #define HP_INSTR_SIZE sizeof(HOOKPOINT_INSTR)
-#define HP_INSTR_LEN (HP_INSTR_SIZE/sizeof(instruction_t))
+#define HP_INSTR_LEN INSTR_LEN(HP_INSTR_SIZE)
 #define HP_WRAPPER_ADDR 2
 
 const instruction_t IRQ_WRAPPER_INSTR[] = {
@@ -138,7 +144,7 @@ const instruction_t IRQ_WRAPPER_INSTR[] = {
 };
 
 #define IW_INSTR_SIZE sizeof(IRQ_WRAPPER_INSTR)
-#define IW_INSTR_LEN (IW_INSTR_SIZE/sizeof(instruction_t))
+#define IW_INSTR_LEN INSTR_LEN(IW_INSTR_SIZE)
 #define IW_CALL_HANDLER 5
 #define IW_ORIGNAL_IRQ 11
 
@@ -167,7 +173,7 @@ const instruction_t KEY_ONOFF_INSTR[] = {
 };
 
 #define KOO_INSTR_SIZE sizeof(KEY_ONOFF_INSTR)
-#define KOO_INSTR_LEN (KOO_INSTR_SIZE/sizeof(instruction_t))
+#define KOO_INSTR_LEN INSTR_LEN(KOO_INSTR_SIZE)
 #define KOO_INSTR_KEYDATA 19
 #define KOO_INSTR_MEMADDR 20
 
@@ -184,7 +190,7 @@ const instruction_t KEY_ENABLE_INSTR[] = {
 };
 
 #define KEN_INSTR_SIZE sizeof(KEY_ENABLE_INSTR)
-#define KEN_INSTR_LEN (KEN_INSTR_SIZE/sizeof(instruction_t))
+#define KEN_INSTR_LEN INSTR_LEN(KEN_INSTR_SIZE)
 #define KEN_INSTR_KEYDATA 8
 
 const instruction_t MEM_OVERWRITE_INSTR[] = {
@@ -203,16 +209,16 @@ const instruction_t MEM_OVERWRITE_INSTR[] = {
 };
 
 #define MO_INSTR_SIZE sizeof(MEM_OVERWRITE_INSTR)
-#define MO_INSTR_LEN (MO_INSTR_SIZE/sizeof(instruction_t))
+#define MO_INSTR_LEN INSTR_LEN(MO_INSTR_SIZE)
 
 static int end_of_rom( CodeLocation addr, u32 size )
 {
-    CodeLocation prom = addr + size/sizeof(instruction_t) - 1;
+    CodeLocation prom = addr + INSTR_LEN( size ) - 1;
     while( addr < prom && (CodeAtLocation(prom) == 0x00000000 || CodeAtLocation(prom) == 0xffffffff) ) 
     {
         prom--;
     }
-    return sizeof(instruction_t) * (prom + 2 - addr); // consider the first 0x00000000/0xffffffff as in-using
+    return INSTR_SIZE * (prom + 2 - addr); // consider the first 0x00000000/0xffffffff as in-using
 }
 
 #define MASK_PC0( m ) (pc[0]&m)
@@ -301,11 +307,11 @@ static int cht_calc_needsize( int mode, int numirq )
         {
             acl_elemlen_t len;
             acl_select_entry( MAKE_ENT(i, val), &len );
-            total += len*sizeof(instruction_t);
+            total += len*INSTR_SIZE;
         }
     }
 
-    return total + sizeof(instruction_t);
+    return total + 1*INSTR_SIZE;    // the zero-end marks for cheat data
 }
 
 static CodeLocation rom_fit_newsize( CodeLocation rom, int realend, int totalsize, u32 *newsize )
@@ -316,13 +322,13 @@ static CodeLocation rom_fit_newsize( CodeLocation rom, int realend, int totalsiz
         // get the biggest space that all bytes is 0
         CodeLocation found=NULL, current=NULL;
         int szfound=0, szcurrent=0;
-        int reallen = realend / sizeof(instruction_t);
+        int reallen = INSTR_LEN( realend );
         for( int i=0; i < reallen; ++i )
         {
             if( rom[i] == 0 )
             {
                 if( szcurrent == 0 ) current = rom+i;
-                szcurrent += sizeof(instruction_t);
+                szcurrent += INSTR_SIZE;
             }
             else if( szcurrent > 0 )
             {
@@ -338,7 +344,7 @@ static CodeLocation rom_fit_newsize( CodeLocation rom, int realend, int totalsiz
         // the zero-filled space is big enough, 3 is a guess value
         if( szfound > totalsize * 3 )
         {
-            return found + 80;
+            return found + FIT_SPACE_RESERVED;
         }
         else return NULL;
     }
@@ -346,15 +352,15 @@ static CodeLocation rom_fit_newsize( CodeLocation rom, int realend, int totalsiz
     {
         // 似乎没什么要动的
         *newsize = size + 1;    // reserve a word for padding
-        return rom + realend / sizeof(instruction_t);
+        return rom + INSTR_LEN( realend );
     }
     
-    return rom + realend / sizeof(instruction_t);
+    return rom + INSTR_LEN( realend );
 }
 
 static void rom_patch_hookpoint( CodeLocation start, CodeLocation hookpoint[MAX_HOOKPOINT], int hookcnt )
 {
-    u32 addr = 0x8000000 + (start-ROM_LOC)*sizeof(instruction_t);
+    u32 addr = GBA_CART_ADDR + (start-ROM_LOC)*INSTR_SIZE;
     for( int i=0; i < hookcnt; ++i )
     {
         CodeLocation hook_point = hookpoint[i];
@@ -425,7 +431,7 @@ cheat_error_t apply_cheat( int mode, u32 szrom, u16 bindkey, u32 storagemem, u32
     // find hook point
     CodeLocation hookpoint[MAX_HOOKPOINT];
     memset( hookpoint, 0, sizeof(hookpoint) );
-    int n_hookpoint = rom_search_hookpoint( romdata, realend/sizeof(u32) - 3, hookpoint ); // hook point need at least 3 instructions
+    int n_hookpoint = rom_search_hookpoint( romdata, INSTR_LEN(realend) - 3, hookpoint ); // hook point need at least 3 instructions
     if( n_hookpoint == 0 ) return CCHT_NO_IRQ;
 
     // find free space to put new code
diff --git a/source/arm11/filebrowser.c b/source/arm11/filebrowser.c
index c6451b9..7d02b6d 100644
--- a/source/arm11/filebrowser.c
+++ b/source/arm11/filebrowser.c
@@ -416,6 +416,7 @@ static atp_pageopt_t serve_on_key( atp_callerdata_t data, atp_counter_t index, a
 		uint8_t status = DISP_REGION;
 		atp_counter_t defi = 0;
 		acl_entryid_t eid = 0;
+		atp_tips(NULL, "确定A/取消B");
 
 		while( status != DISP_DONE )
 		{
@@ -481,6 +482,7 @@ static atp_pageopt_t serve_on_key( atp_callerdata_t data, atp_counter_t index, a
 		}
 
 		acl_close_lib();
+		atp_tips( NULL, "指引：按START" );
 		return WAIT_ON_ACT( res );
 	}
 	return ATP_PAGE_NOOPTION;
diff --git a/source/arm11/open_agb_firm.c b/source/arm11/open_agb_firm.c
index 998d5e5..f11c085 100644
--- a/source/arm11/open_agb_firm.c
+++ b/source/arm11/open_agb_firm.c
@@ -143,7 +143,6 @@ atp_text_t config_help[] =
 	"~    ~    ~    ~    ~    ~    ~",
 	"-修改后的全局参数保存在config.ini　",
 	"保存修改时，存档方案的修改不会保存",
-	"~    ~    ~    ~    ~    ~    ~",
 	"-金手指组合键为下方向+L+R+SELECT",
 	" 也可以使用HOME键直接代替组合键　",
 	"~    ~    ~    ~    ~    ~    ~",