I won't update this kernel since I don't have Z5P.
NOTE: This kernel is not for people who don't read official instruction at Sony Developer World!
This note is ridiculous, but some people don't read long instruction even if it has risk.
NOTE: You should search how to setup adb and fastboot.
You can find how to for unlocking bootloader on Sony Developer World.
1. Download Z5P_AndroPlusKernel_v4a.zip and twrp-18.104.22.168-E6853-20151122_material.img
You also need SuperSU from this thread
2. Enter into fastboot mode and run these commands in same folder you downloaded 1.
fastboot flash boot boot.img fastboot flash recovery twrp-22.214.171.124-E6853-20151122_material.img fastboot reboot
4. Install SuperSU zip
5. Reboot and rooting is done
If TWRP didn't work, you can alternatively do this:
adb shell rootsh +p ./SuperSU_files/install_SuperSU.sh reboot
Device tree -