after long serach,,,,,could not find and was end up with nothing
till i remebr once, that i had rooted chines tab vis some privte app....
so i give it try on the Kindle HD 7, with the last OS 7.4.9,,,,and capooooooooom
it worked, and rooted.
try for you self
and then i used this link to make the kindle dual boot, so i do not lose the amazon feel.
let me know all