New Unified TWRP for Asus Zenfone 5z is UP.
Download : TWRP Recovery Image for Zenfone 5z(ZS620KL) by jackeagle
TWRP Recovery Installer zip for Zenfone 5z(ZS620KL) by jackeagle
Steps to install : Refer Post #2
Changelog : Refer Post #3
1. This is a massive update. Now you can flash both custom roms and zenui via same twrp, so no need to flash fbrom to go to zenui.
2. To use this, flash the provided zip inside existing twrp and reboot to recovery. The rom flashing process remains the same.
3. Old custom roms and kernels can't be flashed on this. Wait for newer versions to use this twrp. If you want to use old version of a rom/kernel, use old twrp.