Originally Posted by evergamer
My bad, I didn't know that. They've been removed.
It seems the 4.0.X img is what did the trick. I used the same kernel and diag from before, but I used the 4.0.X download which contained a .bin instead of a .img file. Changed the command to reflect that and it worked! My kindle is running properly as I type this.
Seriously, thank you all so much for the help.
I added your "success report" to "the list".