No need to update texture before overwriting it with CopyImage.

src/common/version.h

 #define MAJOR_VERSION 0
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 681
+#define BUILD_REVISION 682
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/libGLESv2/Texture.cpp

@@ -1488,8 +1488,6 @@ void Texture2D::copyImage(GLint level, GLenum format, GLint x, GLint y, GLsizei
         {
             convertToRenderTarget();
         }
-        
-        updateTexture();
 
         if (width != 0 && height != 0 && level < levelCount())
         {
@@ -2356,8 +2354,6 @@ void TextureCubeMap::copyImage(GLenum target, GLint level, GLenum format, GLint
         {
             convertToRenderTarget();
         }
-        
-        updateTexture();
 
         ASSERT(width == height);