I used to use twrp multirom on my previous phone and also on my zuk z2 pro.
Unless i'm mistaken twrp multirom is not maintained any more for this device.
I recently updated my z2 pro to oreo with aex 5.3 (previously on nougat with aex 4.x)
I took the opportunity to test Dual Boot...
When i enable usb debugging mode, sometimes it works few minutes before it disconnect sometimes only few seconds. When it disconnect, icon disappears and few seconds later it reconnect without doing anything. When it happens too often it keep disconnect.
This problem occurs on stock rom...