need help to downgrade fw


hello guys . i have psp 3006 wid 6.35pro firmware and i m trying to downgrade it to fw 6.20 . I followed this tutorial
and getting ERROR , updater MD5 mismatch !
the module of my psp is 9g
so can u pls tell me wat i do now and how i can downgrade it .if its not possible to downgrade my psp so what u guys suggest me to install any good CFW coz 6.35 pro is not a good . i hate to load games frm isoloader and its important for 6.35 pro
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