The problem is k800i is completed different when comparing it to k850i.
It dont have:
-Flash lite 2.1
-Mediaplayer 3.0 but 2.0

And I don't have an k800i.
So that will be to difficult.
And K800i is one of the most modded SE phones in the world.
There are so much patches and more. So I think you can find enough other cool
stuf.