diff --git a/arm9/src/storage.c b/arm9/src/storage.c
index fc56487..e6cdcd7 100644
--- a/arm9/src/storage.c
+++ b/arm9/src/storage.c
@@ -176,9 +176,9 @@ bool writeToFile(FILE* fd, const char* buffer, size_t size)
 	return toWrite == 0;
 }
 
-bool calculateFileSha1(FILE* f, void* digest)
+bool calculateFileSha1Offset(FILE* f, void* digest, size_t offset)
 {
-	fseek(f, 0, SEEK_SET);
+	fseek(f, offset, SEEK_SET);
 	
 	swiSHA1context_t ctx;
 	ctx.sha_block = 0; //this is weird but it has to be done
@@ -198,14 +198,14 @@ bool calculateFileSha1(FILE* f, void* digest)
 	return true;
 }
 
-bool calculateFileSha1Path(const char* path, void* digest)
+bool calculateFileSha1PathOffset(const char* path, void* digest, size_t offset)
 {
 	FILE* targetFile = fopen(path, "rb");
 	if (!targetFile)
 	{
 		return false;
 	}	
-	bool res = calculateFileSha1(targetFile, digest);
+	bool res = calculateFileSha1Offset(targetFile, digest, offset);
 	fclose(targetFile);
 	return res;
 }
diff --git a/arm9/src/storage.h b/arm9/src/storage.h
index 5766511..c5708a6 100644
--- a/arm9/src/storage.h
+++ b/arm9/src/storage.h
@@ -16,8 +16,15 @@ unsigned long long getFileSize(FILE* f);
 unsigned long long getFileSizePath(char const* path);
 bool toggleFileReadOnly(const char* path, bool readOnly);
 bool writeToFile(FILE* fd, const char* buffer, size_t size);
-bool calculateFileSha1(FILE* f, void* digest);
-bool calculateFileSha1Path(const char* path, void* digest);
+bool calculateFileSha1Offset(FILE* f, void* digest, size_t offset);
+bool calculateFileSha1PathOffset(const char* path, void* digest, size_t offset);
+static inline bool calculateFileSha1(FILE* f, void* digest) {
+    return calculateFileSha1Offset(f, digest, 0);
+}
+
+static inline bool calculateFileSha1Path(const char* path, void* digest) {
+    return calculateFileSha1PathOffset(path, digest, 0);
+}
 
 //Directories
 bool safeCreateDir(const char* path);
@@ -31,4 +38,4 @@ u32 getClusterSizeForPartition(const char* path);
 }
 #endif
 
-#endif
\ No newline at end of file
+#endif
diff --git a/arm9/src/unlaunch.cpp b/arm9/src/unlaunch.cpp
index 79495fb..c23f324 100644
--- a/arm9/src/unlaunch.cpp
+++ b/arm9/src/unlaunch.cpp
@@ -235,14 +235,16 @@ bool uninstallUnlaunch(const consoleInfo& info, bool removeHNAABackup)
 
 static bool writeUnlaunchTmd(const char* path)
 {
-	Sha1Digest expectedDigest, actualDigest;
-	swiSHA1Calc(expectedDigest.data(), unlaunchInstallerBuffer, unlaunchInstallerSize + 520);
-	if(calculateFileSha1Path(path, actualDigest.data()) && expectedDigest == actualDigest)
+    static constexpr auto unlaunchShaOffset = 0x4000;
+    Sha1Digest expectedDigest, actualDigest;
+    swiSHA1Calc(expectedDigest.data(), unlaunchInstallerBuffer + unlaunchShaOffset,
+                (unlaunchInstallerSize + 520) - unlaunchShaOffset);
+    if(calculateFileSha1PathOffset(path, actualDigest.data(), unlaunchShaOffset) && expectedDigest == actualDigest)
 	{
 		// the tmd hasn't changed, no need to do anything
 		return true;
 	}
-	
+
 	FILE* targetTmd = fopen(path, "wb");
 	if (!targetTmd)
 	{
@@ -260,7 +262,7 @@ static bool writeUnlaunchTmd(const char* path)
 	
 	fclose(targetTmd);
 	
-	if(!calculateFileSha1Path(path, actualDigest.data()) || expectedDigest != actualDigest)
+    if(!calculateFileSha1PathOffset(path, actualDigest.data(), unlaunchShaOffset) || expectedDigest != actualDigest)
 	{
 		removeIfExists(path);
 		messageBox("\x1B[31mError:\x1B[33m Unlaunch tmd was not properly written\n");