diff --git a/README.md b/README.md
index 20193fe..a3521cd 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This has *barely* been tested and should be used with *extreme caution*. Please
 ## Features
 - Install DSiWare and homebrew onto your hiyaCFW SDNAND and SysNAND DSi Menus.
 
-- Delete system titles and others hidden from Data Management.
+- Delete system titles and others hidden from Data Management on SDNAND.
 
 - Backup and restore installed titles.
 
diff --git a/arm9/src/install.c b/arm9/src/install.c
index 736ed23..df9da17 100644
--- a/arm9/src/install.c
+++ b/arm9/src/install.c
@@ -299,12 +299,8 @@ bool install(char* fpath, bool systemTitle)
 			return false;
 	}
 
-	if(!sdnandMode && !nandio_unlock_writing())
-		return false;
-
 	//start installation
 	clearScreen(&bottomScreen);
-	iprintf("Installing %s\n\n", fpath); swiWaitForVBlank();
 
 	tDSiHeader* h = getRomHeader(fpath);	
 
@@ -327,8 +323,7 @@ bool install(char* fpath, bool systemTitle)
 		//title id must be one of these
 		if (h->tid_high == 0x00030004 ||
 			h->tid_high == 0x00030005 ||
-			h->tid_high == 0x00030015 ||
-			h->tid_high == 0x00030017)
+			h->tid_high == 0x00030015)
 		{}
 		else
 		{
@@ -340,6 +335,24 @@ bool install(char* fpath, bool systemTitle)
 			goto error;
 		}
 
+		if (!sdnandMode &&
+			(h->tid_high == 0x00030005 ||
+			h->tid_high == 0x00030015))
+		{
+			iprintf("\x1B[31m");	//red
+			iprintf("Error: ");
+			iprintf("\x1B[33m");	//yellow
+			iprintf("This title cannot be\ninstalled to SysNAND.\n");
+			iprintf("\x1B[47m");	//white
+			goto error;
+		}
+
+		if(!sdnandMode && !nandio_unlock_writing())
+		return false;
+
+		clearScreen(&bottomScreen);
+		iprintf("Installing %s\n\n", fpath); swiWaitForVBlank();
+
 		//get install size
 		iprintf("Install Size: ");
 		swiWaitForVBlank();
@@ -371,7 +384,7 @@ bool install(char* fpath, bool systemTitle)
 		{
 			if (!_checkDsiSpace(installSize))
 			{
-				if (choicePrint("Install as system title?"))
+				if (sdnandMode && choicePrint("Install as system title?"))
 				{
 					h->tid_high = 0x00030015;
 					fixHeader = true;
diff --git a/arm9/src/installmenu.c b/arm9/src/installmenu.c
index 969ecf1..83426f3 100644
--- a/arm9/src/installmenu.c
+++ b/arm9/src/installmenu.c
@@ -100,7 +100,8 @@ void installMenu()
 								break;
 								
 							case INSTALL_MENU_SYSTEM_TITLE:
-								install(m->items[m->cursor].value, true);
+								if (sdnandMode)
+									install(m->items[m->cursor].value, true);
 								break;
 
 							case INSTALL_MENU_DELETE:
@@ -247,7 +248,7 @@ static int subMenu()
 	Menu* m = newMenu();
 
 	addMenuItem(m, "Install", NULL, 0);
-	addMenuItem(m, "Install as System Title", NULL, 0);
+	addMenuItem(m, sdnandMode ? "Install as System Title" : "\x1B[37m[Disabled]\x1B[47m", NULL, 0);
 	addMenuItem(m, "Delete", NULL, 0);
 	addMenuItem(m, "Back - [B]", NULL, 0);
 
diff --git a/arm9/src/titlemenu.c b/arm9/src/titlemenu.c
index ad7cd9b..93122c4 100644
--- a/arm9/src/titlemenu.c
+++ b/arm9/src/titlemenu.c
@@ -79,12 +79,16 @@ static void generateList(Menu* m)
 {
 	if (!m) return;
 
-	const int NUM_OF_DIRS = 3;
-	const char* dirs[] = {
+	const int NUM_OF_DIRS = sdnandMode ? 3 : 1;
+	const char* sdnandDirs[] = {
 		"00030004",
 		"00030005",
 		"00030015"
 	};
+	const char* nandDirs[] = {
+		"00030004"
+	};
+	const char** dirs = sdnandMode ? sdnandDirs : nandDirs;
 
 	//Reset menu
 	clearMenu(m);