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 #                              EOS Tools v11                              #
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 #    Taken from chdk forums, source:                                      #
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 #    http://chdk.setepontos.com/index.php?topic=111.msg11400#msg11400     #
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fw1 - 20D/350D firmware file structure
fw2 - 30D/400D/5D firmware file structure (actually 5D structure slightly differs from 30D/400D)
fw3 - 1D/40D firmware file structure 




fw1 ( 20D / 350D )
to decrypt 20D / 350D fw files use decrypt_fw1
structure of decrypted file is unknown. 
probably fw is embedded into flasher.




fw3 (1D/40D)

dissect file using dissect_fw3 tool