Imaging issue DeployStudio I have got all of it set up and imaging went through without a problem, but at the last stage system log showed an error mounting AFPS volume.

When the system rebooted, a folder with ? mark showed on the screen. I made attempt to boot the system using startup disk and checked disk utility, it shows disc not mounted.

Am I missing something here? Please help.
This isn't directly related to what @fsb suggests because this issue is caused by the fact the machine needs a firmware update, this is part of the usual install process of High Sierra, but if you've been using images it won't have the Firmware update.

There are some steps to try on this website which I myself am trying now...

https://www.amsys.co.uk/deploying-firmware-updates-imaging/