I am not sure either since I don't have a xbox with K 5530.. but I read this
trouble shooting guide when I was modding.. http://forums.xbox-scene.com/index.php?act=ST&f=45&t=150299&s=10decc4f3e672bbe
6d701a7e5bf18579
Basically it mentions about the problem of PBL with Kernel 5530.
It also mentions about applelinux screen flickering problem.