diff --git a/src/gui/update_ext.cpp b/src/gui/update_ext.cpp
index 0346eeb3d..ac8eade26 100644
--- a/src/gui/update_ext.cpp
+++ b/src/gui/update_ext.cpp
@@ -71,6 +71,7 @@ CExtUpdate::CExtUpdate()
 	fLogfile        = "/tmp/update.log";
 	mountPkt 	= "/tmp/image_mount";
 	FileHelpers 	= NULL;
+	MTDBuf		= NULL;
 	flashErrorFlag	= false;
 	total = bsize = used = 0;
 	free1 = free2 = free3 = 0;
@@ -84,6 +85,8 @@ CExtUpdate::~CExtUpdate()
 {
 	if(FileHelpers)
 		delete[] FileHelpers;
+	if(MTDBuf)
+		delete[] MTDBuf;
 	copyList.clear();
 	blackList.clear();
 	deleteList.clear();
@@ -105,12 +108,17 @@ bool CExtUpdate::ErrorReset(bool modus, const std::string & msg1, const std::str
 		umount(mountPkt.c_str());
 //		my_system(2,"rmmod", mtdramDriver.c_str());
 	}
-	if (modus & RESET_FD1)
+	if (modus & CLOSE_FD1)
 		close(fd1);
-	if (modus & RESET_FD2)
+	if (modus & CLOSE_FD2)
 		close(fd2);
-	if (modus & RESET_F1)
+	if (modus & CLOSE_F1)
 		fclose(f1);
+	if (modus & DELETE_MTDBUF) {
+		if (MTDBuf != NULL)
+			delete[] MTDBuf;
+		MTDBuf = NULL;
+	}
 
 	if (msg2 == "")
 		snprintf(buf, sizeof(buf), "%s\n", msg1.c_str());
@@ -276,19 +284,19 @@ bool CExtUpdate::applySettings()
 	}
 
 	int MTDBufSize = 0xFFFF;
-	char *MTDBuf   = new char[MTDBufSize];
+	MTDBuf         = new char[MTDBufSize];
 	// copy image to mtdblock
 	if (MTDBuf == NULL)
-		return ErrorReset(RESET_UNLOAD, "malloc error");
+		return ErrorReset(RESET_UNLOAD, "memory allocation error");
 	fd1 = open(imgFilename.c_str(), O_RDONLY);
 	if (fd1 < 0)
-		return ErrorReset(RESET_UNLOAD, "cannot read image file: " + imgFilename);
+		return ErrorReset(RESET_UNLOAD | DELETE_MTDBUF, "cannot read image file: " + imgFilename);
 	long filesize = lseek(fd1, 0, SEEK_END);
 	lseek(fd1, 0, SEEK_SET);
 	if(filesize == 0)
-		return ErrorReset(RESET_UNLOAD | RESET_FD1, "image filesize is 0");
+		return ErrorReset(RESET_UNLOAD | CLOSE_FD1 | DELETE_MTDBUF, "image filesize is 0");
 	if(filesize > mtdSize)
-		return ErrorReset(RESET_UNLOAD | RESET_FD1, "image filesize too large");
+		return ErrorReset(RESET_UNLOAD | CLOSE_FD1 | DELETE_MTDBUF, "image filesize too large");
 	fd2 = -1;
 	int tmpCount = 0;
 	while (fd2 < 0) {
@@ -299,7 +307,7 @@ bool CExtUpdate::applySettings()
 		sleep(1);
 	}
 	if (fd2 < 0)
-		return ErrorReset(RESET_UNLOAD | RESET_FD1, "cannot open mtdBlock");
+		return ErrorReset(RESET_UNLOAD | CLOSE_FD1 | DELETE_MTDBUF, "cannot open mtdBlock");
 	long fsize = filesize;
 	long block;
 	while(fsize > 0) {
@@ -316,12 +324,15 @@ bool CExtUpdate::applySettings()
 	FileHelpers->createDir(mountPkt.c_str(), 0755);
 	int res = mount(mtdBlockFileName.c_str(), mountPkt.c_str(), "jffs2", 0, NULL);
 	if (res)
-		return ErrorReset(RESET_UNLOAD, "mount error");
+		return ErrorReset(RESET_UNLOAD | DELETE_MTDBUF, "mount error");
 
 	if (get_fs_usage(mountPkt.c_str(), total, used, &bsize))
 		free1 = (total * bsize) / 1024 - (used * bsize) / 1024;
 
 	if (!readBackupList(mountPkt)) {
+		if (MTDBuf != NULL)
+			delete[] MTDBuf;
+		MTDBuf = NULL;
 		if (flashErrorFlag)
 			return false;
 		return ErrorReset(0, "error readBackupList");
@@ -329,20 +340,20 @@ bool CExtUpdate::applySettings()
 
 	res = umount(mountPkt.c_str());
 	if (res)
-		return ErrorReset(RESET_UNLOAD, "unmount error");
+		return ErrorReset(RESET_UNLOAD | DELETE_MTDBUF, "unmount error");
 
 	unlink(imgFilename.c_str());
 
 	// copy mtdblock to image
 	if (MTDBuf == NULL)
-		return ErrorReset(RESET_UNLOAD, "malloc error");
+		return ErrorReset(RESET_UNLOAD, "memory allocation error");
 	fd1 = open(mtdBlockFileName.c_str(), O_RDONLY);
 	if (fd1 < 0)
-		return ErrorReset(RESET_UNLOAD, "cannot read mtdBlock");
+		return ErrorReset(RESET_UNLOAD | DELETE_MTDBUF, "cannot read mtdBlock");
 	fsize = mtdRamSize;
 	fd2 = open(imgFilename.c_str(), O_WRONLY | O_CREAT);
 	if (fd2 < 0)
-		return ErrorReset(RESET_UNLOAD | RESET_FD1, "cannot open image file: ", imgFilename);
+		return ErrorReset(RESET_UNLOAD | CLOSE_FD1 | DELETE_MTDBUF, "cannot open image file: ", imgFilename);
 	while(fsize > 0) {
 		block = fsize;
 		if(block > (long)MTDBufSize)
@@ -358,7 +369,7 @@ bool CExtUpdate::applySettings()
 	// check image file size
 	if (mtdRamSize != fsizeDst) {
 		unlink(imgFilename.c_str());
-		return ErrorReset(0, "error file size: ", imgFilename);
+		return ErrorReset(DELETE_MTDBUF, "error file size: ", imgFilename);
 	}
 
 	// unload mtdramDriver only
@@ -367,7 +378,8 @@ bool CExtUpdate::applySettings()
 	if(hintBox)
 		hintBox->hide();
 
-	delete[] MTDBuf;
+	if (MTDBuf != NULL)
+		delete[] MTDBuf;
 	MTDBuf = NULL;
 	sync();
 	return true;
@@ -546,7 +558,7 @@ bool CExtUpdate::readBackupList(const std::string & dstPath)
 	fgetpos(f1, &fz);
 	fseek(f1, 0, SEEK_SET);
 	if (fz.__pos == 0)
-		return ErrorReset(RESET_F1, "backuplist filesize is 0");
+		return ErrorReset(CLOSE_F1, "backuplist filesize is 0");
 	size_t pos;
 	std::string line;
 
diff --git a/src/gui/update_ext.h b/src/gui/update_ext.h
index 18280d161..c53b3e247 100644
--- a/src/gui/update_ext.h
+++ b/src/gui/update_ext.h
@@ -39,15 +39,17 @@ class CExtUpdate
 		enum
 		{
 			RESET_UNLOAD	= 1,
-			RESET_FD1	= 2,
-			RESET_FD2	= 4,
-			RESET_F1	= 8
+			CLOSE_FD1	= 2,
+			CLOSE_FD2	= 4,
+			CLOSE_F1	= 8,
+			DELETE_MTDBUF	= 16
 		};
 		std::string imgFilename;
 		std::string mtdRamError;
 		int mtdNumber;
 		int fd1, fd2;
 		FILE *f1;
+		char *MTDBuf;
 		std::string mtdramDriver;
 		std::string backupList, defaultBackup;
 		std::string mountPkt;