diff --git a/include/firmwriter.h b/include/firmwriter.h
index 404d6e4..1d6c02a 100644
--- a/include/firmwriter.h
+++ b/include/firmwriter.h
@@ -28,8 +28,8 @@
 {
 	UPDATE_ERR_INVALID_FIRM  = -2, // Corrupted FIRM
 	UPDATE_ERR_INVALID_SIG   = -3, // Signature verification error
-	UPDATE_ERR_DOWNGRADE     = -5, // Update file is a lower version than installed
-	UPDATE_ERR_NOT_INSTALLED = -10 // fastboot3DS is not installed in firm0:/
+	UPDATE_ERR_NOT_INSTALLED = -9, // fastboot3DS is not installed in firm0:/
+	UPDATE_ERR_DOWNGRADE     = -10 // Update file is a lower version than installed
 };
 
 
diff --git a/source/arm9/firmwriter.c b/source/arm9/firmwriter.c
index d78608e..7f85801 100644
--- a/source/arm9/firmwriter.c
+++ b/source/arm9/firmwriter.c
@@ -140,18 +140,17 @@
 	// Check version
 	const u32 vers = *(u32*)((void*)updateBuffer + 0x210);
 	if(version) *version = vers;
-	if(vers < ((u32)VERS_MAJOR<<16 | VERS_MINOR)) return UPDATE_ERR_DOWNGRADE;
 
 	size_t partInd, sector;
-	if(!partitionGetIndex("firm0", &partInd)) return -6;
-	if(!partitionGetSectorOffset(partInd, &sector)) return -7;
+	if(!partitionGetIndex("firm0", &partInd)) return -5;
+	if(!partitionGetSectorOffset(partInd, &sector)) return -6;
 
 	u8 *firm0Buf = (u8*)malloc(0x200);
-	if(!firm0Buf) return -8;
+	if(!firm0Buf) return -7;
 	if(!dev_decnand->read_sector(sector + 1, 1, firm0Buf))
 	{
 		free(firm0Buf);
-		return -9;
+		return -8;
 	}
 
 	// verify fastboot is installed to firm0:/
@@ -163,5 +162,7 @@
 
 	free(firm0Buf);
 
+	if(vers < ((u32)VERS_MAJOR<<16 | VERS_MINOR)) return UPDATE_ERR_DOWNGRADE;
+
 	return 0;
 }