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Originally posted by Chooch
You cant downgrade. The upgrade will re-write to the rom and even if you hard reset you will still have 2003. Sorry 
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But....the A02, A03, etc. Updates also re-write the ROM. So therefore, you could POSSIBLY just install the old "upgrade" again and *bam* you're back to PPC2002. None of us are 100% sure of how the MM2003 upgrade is performed though, so there is no way to tell until the copies get mailed off. :)