Head over to the motopie thread. Read it. Here's is what you need to do in the order you need to do it.
Root w/pie
Run motowpnomo
Install SU to system.
Verify root
Update to 4.4/19.6.3
Then tell him unless he wants to lose system write access, stay on 19.6.3.
That's what you have to do. It's up to you to read the many threads that explain how to do this.