I broke the screen of my bf's first kindle

(2nd gen! T.T ) now he has a K2T

he usually hacks and repairs everything... but he refuses to do so on a Kindle XD I'll needle him till he jb (via serial port) his one
Yeah, I've already downloaded everything and made a txt file with all the instructions found here
Thanks for your reply... I can't wait to put my hands on the k4