@lovexiuxiu
Hi, and welcome to mobileread forums
. Unfortunatelly, I don't have K4 and I don't use Kite, so I can't help you, but hopefully Iņigo will be able to walk you through it.
I'd like to take this opportunity to ask someone far more knowledgable than me, and who also possesses K4NT to make a Kite update install package for K4NT, to allow easy installation to non techie users (* Kai771 whistles, conspicuously looking in NiLuJe's direction *)
.