Can't downgrade with update.zip

Hi meizufans!
I updated to 4.5.7.1, but I didn’t like and decided to downgrade to 4.2.8.2i or 3.5.3. I put the file update.zip in the root directory, all according to the instructions, but the phone says “Firmvare not found.” I don’t want to be updated with the .bin because i need International “I” firmware.
How to downgrade with 4.2.8.2i .zip?

@Stark, downgrade to 4.0.4 i and then upgrade to what you want.

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