I seem to have 2 different versions of this firmware already.
The one in my Local Settings/Kobo directory contains
KoboRoot.tgz CRC A5B85D6D Size 59,280,207 Date 16/03/2012 09:18
The one linked here on the forums at
http://download.kobobooks.com/firmwa...ate-1.9.17.zip contains
KoboRoot.tgz CRC 2B005F71 Size 59,293,286 Date 16/03/2012 16:44
Both archives extract without errors. Perhaps a last minute correction, or a regional/affiliates thing (im in england).. ???