TWRP Recovery 3.0.2-0 (Marshmallow)

fastboot boot twrp-3.0.2-0-ze500kl.img

Flash UPDATE-SuperSU-v2.65.zip to root

This TWRP will automatically unlock bootloader
To relock bootloader, flash relock_bootloader.zip via twrp recovery

TWRP Recovery 3.0.0-0 (Lolipop)

fastboot boot twrp-3.0.0-0-ze500kl.img

uncheck mount system read-only
flash SuperSu zip to get root
reboot