I seem to have some issues with setting this up in kali nethunter.
How did you get the image from your mac to your nexus device. Should usb debbuging and MTP be enabled. The cable that needed to be use is it usb micro from nexus device to usb a to your computer.
The way i did it was attached the image and emailed it. I then opened it on my nexus device and dowloaded it and then added it to drivedroid like it was done in the video. I followed the steps as in the video, changed the bios settings and connected my nexus device to laptop and started my laptop and nothing. It just boot up in windows. I did this on two laptops and no joy.
So i must be doing something wrong and hope you can help.