diff --git a/arm7/source/fvPlayer7.c b/arm7/source/fvPlayer7.c
index 1be22ee..4909c98 100644
--- a/arm7/source/fvPlayer7.c
+++ b/arm7/source/fvPlayer7.c
@@ -5,6 +5,7 @@
 #include "fat.h"
 #include "adpcm.h"
 #include "irqWait.h"
+#include "../../common/twlwram.h"
 #include "fvPlayer7.h"
 
 #define FV_AUDIO_START_OFFSET 12
@@ -324,8 +325,13 @@ static void handleFifo(u32 value)
         }
 
         case IPC_CMD_HANDSHAKE:
-            fifoSendValue32(FIFO_USER_01, IPC_CMD_PACK(IPC_CMD_HANDSHAKE, 0));
+        {
+            bool canUseWram = false;
+            if (isDSiMode())
+                canUseWram = twr_isUnlocked();
+            fifoSendValue32(FIFO_USER_01, IPC_CMD_PACK(IPC_CMD_HANDSHAKE, canUseWram ? 1 : 0));
             break;
+        }
     }
 }
 
diff --git a/arm7/source/main.c b/arm7/source/main.c
index 362bef6..7fc898d 100644
--- a/arm7/source/main.c
+++ b/arm7/source/main.c
@@ -114,8 +114,14 @@ int main(void)
 
     if (isDSiMode())
     {
-        twr_setBlockMapping(TWR_WRAM_BLOCK_B, 0x03100000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
-        twr_setBlockMapping(TWR_WRAM_BLOCK_C, 0x03140000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
+        if (twr_isUnlockable())
+            twr_unlockAll();
+
+        if (twr_isUnlocked())
+        {
+            twr_setBlockMapping(TWR_WRAM_BLOCK_B, 0x03100000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
+            twr_setBlockMapping(TWR_WRAM_BLOCK_C, 0x03140000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
+        }
 
         // switch to 47kHz output
         REG_SNDEXTCNT = 0;
diff --git a/arm9/source/FastVideo/fvPlayer.c b/arm9/source/FastVideo/fvPlayer.c
index 4f0cc47..2f458d4 100644
--- a/arm9/source/FastVideo/fvPlayer.c
+++ b/arm9/source/FastVideo/fvPlayer.c
@@ -199,10 +199,10 @@ static u32* makeMbRenderDl(u32* displayList, int height, u32 texParam)
     return displayList;
 }
 
-bool fv_initPlayer(fv_player_t* player, const char* filePath)
+bool fv_initPlayer(fv_player_t* player, const char* filePath, bool useWram)
 {
     memset(player, 0, sizeof(fv_player_t));
-    if (isDSiMode())
+    if (isDSiMode() && twr_isUnlocked() && useWram)
         player->dataBuffer = (u8*)twr_getBlockAddress(TWR_WRAM_BLOCK_B);
     else
         player->dataBuffer = memalign(32, FV_PLAYER_DATA_BUFFER_SIZE * FV_PLAYER_DATA_BUFFER_COUNT);
diff --git a/arm9/source/FastVideo/fvPlayer.h b/arm9/source/FastVideo/fvPlayer.h
index 6feff04..994f95e 100644
--- a/arm9/source/FastVideo/fvPlayer.h
+++ b/arm9/source/FastVideo/fvPlayer.h
@@ -46,7 +46,7 @@ typedef struct
 extern "C" {
 #endif
 
-bool fv_initPlayer(fv_player_t* player, const char* filePath);
+bool fv_initPlayer(fv_player_t* player, const char* filePath, bool useWram);
 void fv_destroyPlayer(fv_player_t* player);
 void fv_startPlayer(fv_player_t* player);
 void fv_updatePlayer(fv_player_t* player);
diff --git a/arm9/source/main.cpp b/arm9/source/main.cpp
index b6b1bbc..543166d 100644
--- a/arm9/source/main.cpp
+++ b/arm9/source/main.cpp
@@ -20,12 +20,14 @@ int main(int argc, char** argv)
 
     mpu_enableVramCache();
 
-    if (isDSiMode())
+    bool canUseWram = false;
+    if (isDSiMode() && twr_isUnlocked())
     {
         twr_setBlockMapping(TWR_WRAM_BLOCK_A, 0x03000000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
         twr_setBlockMapping(TWR_WRAM_BLOCK_B, 0x03100000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
         twr_setBlockMapping(TWR_WRAM_BLOCK_C, 0x03140000, 0x40000, TWR_WRAM_BLOCK_IMAGE_SIZE_256K);
         mpu_enableTwlWramCache();
+        canUseWram = true;
     }
 
     fifoSetValue32Handler(FIFO_USER_01, NULL, NULL);
@@ -33,7 +35,10 @@ int main(int argc, char** argv)
     // handshake
     fifoSendValue32(FIFO_USER_01, IPC_CMD_PACK(IPC_CMD_HANDSHAKE, 0));
     fifoWaitValue32(FIFO_USER_01);
-    fifoGetValue32(FIFO_USER_01);
+    u32 handShake = fifoGetValue32(FIFO_USER_01);
+
+    if (canUseWram && (handShake & IPC_CMD_ARG_MASK) == 0)
+        canUseWram = false;
 
     if (!isDSiMode())
     {
@@ -72,7 +77,7 @@ int main(int argc, char** argv)
         filePath = argv[1];
 
     // iprintf("Playing %s\n", filePath);
-    if (fv_initPlayer(&sPlayer, filePath))
+    if (fv_initPlayer(&sPlayer, filePath, canUseWram))
     {
         sPlayerController = new PlayerController(&sPlayer);
         sPlayerController->Initialize();
diff --git a/common/twlwram.h b/common/twlwram.h
index 8651ffb..edbebc3 100644
--- a/common/twlwram.h
+++ b/common/twlwram.h
@@ -93,6 +93,22 @@ void twr_mapWramCSlot(int slot, TWRWramCSlotMaster master, int offset, bool enab
 
 #endif
 
+bool twr_isUnlocked(void);
+
+#ifdef ARM7
+
+static inline bool twr_isUnlockable(void)
+{
+    return (REG_SCFG_EXT & 0x80000000) != 0;
+}
+
+static inline void twr_unlockAll(void)
+{
+    REG_MBK9 = 0;
+}
+
+#endif
+
 #ifdef __cplusplus
 }
 #endif
\ No newline at end of file
diff --git a/common/twlwram.twl.c b/common/twlwram.twl.c
index 3dd3dd3..0771251 100644
--- a/common/twlwram.twl.c
+++ b/common/twlwram.twl.c
@@ -66,3 +66,14 @@ void twr_mapWramCSlot(int slot, TWRWramCSlotMaster master, int offset, bool enab
 }
 
 #endif
+
+bool twr_isUnlocked(void)
+{
+    if ((REG_SCFG_EXT & 0x80000000) == 0)
+        return false; // SCFG and MBK registers are permanently locked
+
+    if ((REG_MBK9 & 0xFFFF0F) != 0)
+        return false; // One or more MBK registers are locked
+
+    return true; 
+}