To bearmann:
I think this fail may not be caused by you copying all the three .bin files.In the recent installation document Duokan provides(see this page:
http://www.duokan.com/forum/thread-7709-1-2.html),it says to copy all the three files to the root directory,and kindle will select the corresponding file by itself.
As eLiNK said,the problem may be caused by jailbreak,you can uninstall jailbreak and have another try.Good luck!