Tutorial - Root for LP - Unlocked bootloader
Here is the process I did get to the root, it was exactly that way.
1 - Install via fastboot Z2_desperanto_AdvStkKernel_690_v.2
-> http://forum.xda-developers.com/xperia-z2/development/root-stock-flashable-kernel-23-1-0-690-t3061816
2 - Download...