Downgrade from 4.2.1 to 2.2.1

hi,

want downgrade ipod touch 2. generation original firmware 2.2.1.
downloaded 2.2.1 felixbruns.de , tried restore ipod using firmware.

problem itunes gave me error , said unknown firmware (error 20).

other ideas on how downgrade 4.2.1 2.2.1?

 

us older version of itunes 8.1 , put ipod dfu mode.

 

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