diff --git a/arm9/source/game/nds.h b/arm9/source/game/nds.h
index c7e17a8..0931f00 100644
--- a/arm9/source/game/nds.h
+++ b/arm9/source/game/nds.h
@@ -102,28 +102,32 @@ typedef struct {
     // extended mode stuff (DSi only)
     u8  ignored0[0x30]; // ignored
     u32 region_flags;
-    u8  ignored1[0xC]; // ignored
+    u32 access_control;
+    u32 arm7_scfg_ext7;
+    u8  reserved2[3];
+    u8  srl_flag;
     u32 arm9i_rom_offset;
-    u32 reserved2;
+    u32 reserved3;
     u32 arm9i_load_adress;
     u32 arm9i_size;
     u32 arm7i_rom_offset;
     u32 unknown1;
     u32 arm7i_load_adress;
     u32 arm7i_size;
-    u8  ignored2[0x30]; // ignored
+    u8  ignored1[0x30]; // ignored
     u32 ntr_twl_rom_size;
     u8  unknown2[12];
-    u8  ignored3[0x10]; // ignored
+    u8  ignored2[0x10]; // ignored
     u64 title_id;
     u32 pubsav_size;
     u32 prvsav_size;
-    u8  reserved3[176];
+    u8  reserved4[176];
     u8  unknown3[0x10];
-    u8  ignored4[0xD00]; // ignored
+    u8  ignored3[0xD00]; // ignored
 } PACKED_STRUCT TwlHeader;
 
 u32 ValidateTwlHeader(TwlHeader* twl);
+u32 BuildTwlSaveHeader(void* sav, u32 size);
 u32 LoadTwlMetaData(const char* path, TwlHeader* hdr, TwlIconData* icon);
 u32 GetTwlTitle(char* desc, const TwlIconData* twl_icon);
 u32 GetTwlIcon(u16* icon, const TwlIconData* twl_icon);
diff --git a/arm9/source/game/tmd.c b/arm9/source/game/tmd.c
index d98f4fa..93e8d0f 100644
--- a/arm9/source/game/tmd.c
+++ b/arm9/source/game/tmd.c
@@ -76,7 +76,7 @@ u32 FixTmdHashes(TitleMetaData* tmd) {
     return 0;
 }
 
-u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size, u32 twl_privsave_size) {
+u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size, u32 twl_privsave_size, u8 twl_flag) {
     static const u8 sig_type[4] =  { TMD_SIG_TYPE };
     // safety check: number of contents
     if (n_contents > TMD_MAX_CONTENTS) return 1; // potential incompatibility here (!)
@@ -91,6 +91,7 @@ u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size
     tmd->title_type[3] = 0x40; // whatever
     for (u32 i = 0; i < 4; i++) tmd->save_size[i] = (save_size >> (i*8)) & 0xFF; // le save size
     for (u32 i = 0; i < 4; i++) tmd->twl_privsave_size[i] = (twl_privsave_size >> (i*8)) & 0xFF; // le privsave size
+    tmd->twl_flag = twl_flag;
     tmd->content_count[0] = (u8) ((n_contents >> 8) & 0xFF);
     tmd->content_count[1] = (u8) (n_contents & 0xFF);
     memset(tmd->contentinfo_hash, 0xFF, 0x20); // placeholder (hash)
diff --git a/arm9/source/game/tmd.h b/arm9/source/game/tmd.h
index 9bc6104..8baa5b8 100644
--- a/arm9/source/game/tmd.h
+++ b/arm9/source/game/tmd.h
@@ -62,5 +62,5 @@ u32 ValidateTmdSignature(TitleMetaData* tmd);
 u32 VerifyTmd(TitleMetaData* tmd);
 u32 GetTmdCtr(u8* ctr, TmdContentChunk* chunk);
 u32 FixTmdHashes(TitleMetaData* tmd);
-u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size, u32 twl_privsave_size);
+u32 BuildFakeTmd(TitleMetaData* tmd, u8* title_id, u32 n_contents, u32 save_size, u32 twl_privsave_size, u8 twl_flag);
 u32 BuildTmdCert(u8* tmdcert);
diff --git a/arm9/source/utils/gameutil.c b/arm9/source/utils/gameutil.c
index 6f40012..cca29ad 100644
--- a/arm9/source/utils/gameutil.c
+++ b/arm9/source/utils/gameutil.c
@@ -2011,7 +2011,7 @@ u32 BuildInstallFromNcchFile(const char* path_ncch, const char* path_dest, bool
     if ((BuildCiaHeader(&(cia->header), TICKET_COMMON_SIZE) != 0) ||
         (BuildCiaCert(cia->cert) != 0) ||
         (BuildFakeTicket((Ticket*)&(cia->ticket), title_id) != 0) ||
-        (BuildFakeTmd(&(cia->tmd), title_id, 1, save_size, 0)) ||
+        (BuildFakeTmd(&(cia->tmd), title_id, 1, save_size, 0, 0)) ||
         (FixCiaHeaderForTmd(&(cia->header), &(cia->tmd)) != 0) ||
         (!install && (WriteCiaStub(cia, path_dest) != 0))) {
         free(cia);
@@ -2081,7 +2081,7 @@ u32 BuildInstallFromNcsdFile(const char* path_ncsd, const char* path_dest, bool
     if ((BuildCiaHeader(&(cia->header), TICKET_COMMON_SIZE) != 0) ||
         (BuildCiaCert(cia->cert) != 0) ||
         (BuildFakeTicket((Ticket*)&(cia->ticket), title_id) != 0) ||
-        (BuildFakeTmd(&(cia->tmd), title_id, content_count, save_size, 0)) ||
+        (BuildFakeTmd(&(cia->tmd), title_id, content_count, save_size, 0, 0)) ||
         (FixCiaHeaderForTmd(&(cia->header), &(cia->tmd)) != 0) ||
         (!install && (WriteCiaStub(cia, path_dest) != 0))) {
         free(cia);
@@ -2146,17 +2146,19 @@ u32 BuildInstallFromNdsFile(const char* path_nds, const char* path_dest, bool in
     u8 title_id[8];
     u32 save_size = 0;
     u32 privsave_size = 0;
+    u8 twl_flag = 0;
     
     // Init progress bar
     if (!ShowProgress(0, 0, path_nds)) return 1;
     
-    // load TWL header, get save sizes && title id
+    // load TWL header, get save sizes, srl flag && title id
     if (fvx_qread(path_nds, &twl, 0, sizeof(TwlHeader), NULL) != FR_OK)
         return 1;
     for (u32 i = 0; i < 8; i++)
         title_id[i] = (twl.title_id >> ((7-i)*8)) & 0xFF;
     save_size = twl.pubsav_size;
     privsave_size = twl.prvsav_size;
+    twl_flag = twl.srl_flag;
 
     // some basic sanity checks
     // see: https://problemkaputt.de/gbatek.htm#dsicartridgeheader
@@ -2176,7 +2178,7 @@ u32 BuildInstallFromNdsFile(const char* path_nds, const char* path_dest, bool in
     if ((BuildCiaHeader(&(cia->header), TICKET_COMMON_SIZE) != 0) ||
         (BuildCiaCert(cia->cert) != 0) ||
         (BuildFakeTicket((Ticket*)&(cia->ticket), title_id) != 0) ||
-        (BuildFakeTmd(&(cia->tmd), title_id, 1, save_size, privsave_size)) ||
+        (BuildFakeTmd(&(cia->tmd), title_id, 1, save_size, privsave_size, twl_flag)) ||
         (FixCiaHeaderForTmd(&(cia->header), &(cia->tmd)) != 0) ||
         (!install && (WriteCiaStub(cia, path_dest) != 0))) {
         free(cia);