Problem about glCompressedTexSubImage2D On OpenGLES2.0

I can’t get the updating of the compressed texture to work right.
Here is my code:
glCompressedTexImage2D(GL_TEXTURE_2D, 0,0, 0,128, 128,
glCompressedTexSubImage2D(GL_TEXTURE_2D, 0,0, 0,64, 64,

After I update the texture, nothing changes, it still the old texture.
Did any body know what I’m doing wrong?

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