I was using the latest build for my device: Aex Pie. https://downloads.aospextended.com/Z010D
It has a bug : while we try to reboot it will get stuck in black screen same with power off. The developer who made this rom don't know how to fix that
The only solution I found is this :
For reboot = Press power button ~5 sec
For Recovery = Press power button ~5 sec when vibration comes then press volume down button when asus logo comes then release power button only.
They say its EDL bug which is something gone wrong in kernel source.
Device descriptions are given below Device : Asus Zenfone Max ZC550KL
(Tap to enlarge)