To update system, modem and kernel just install this update from custom recovery and don't forget to wipe cache/dalvik. Now you can use your tablet as P601.
You need to root access and custom recovery to install mod. Tested on TWRP 184.108.40.206
Update: Full P601XXUBMJB_P601OJVBMK1, PDA, MODEM and KERNEL.
Download P602 Phone Enable & Update Mod
Installer is modified from gcrutchr's work at Link .