Thanks again for clarifying. Then I have an additional request. I know that you have done more than enough so only if and when you get some time.
Would it be difficult to modify the prepare_kindle.bin for 2.5.8 so it works on Kindle 3.1, i.e., a package that not only modifies the kernel but also creates a signed back-up file of the rootfs.img? That would be handy for all us Linux-illiterate persons.