K3 Change O.S

Hi all.
I have a Kindle 3 (not touch, this is the old that came with the keyboard).
Well i use it a lot, and in the past i do a dual boot with Duokan.
So i have the option of boot with Duokan or with the o.s. of amazon.
But, i see that there is a "new" (for me) os. that is called KOreader.

So i want to know if there is possible to install this os in this kindle.
(knowing that i already "change things")


Thanks to all.

ps i dont speak english.