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Updates for the 1D Mark II can be found here:
http://consumer.usa.canon.com/ir/controller?act=DownloadDetailAct&fcategoryid=325&modelid=9808#firmware
Updates for the 1Ds Mark II can be found here:
http://consumer.usa.canon.com/ir/controller?act=DownloadDetailAct&fcategoryid=325&modelid=10598#firmware