DeployStudio, however once the firmware has been updated re-imaging is just as before since the firmware process is not needed again. The fact that many Mac models require their firmware updating before you can install High Sierra does make it at least currently much more complex to set this up as an image deployment process using e.g. As the Mac Pro 2010/2012 are some of the oldest models that support High Sierra they definitely needed this.Īpparently some people have 'extracted' the firmware updates from the download and these are installer packages and can be run separately. In this case the main function of the firmware update is to enable booting from an APFS drive on older Macs. There is a strong indication that firmware updates might be issued quite often. The reality maybe that each time you download the High Sierra installer it will contain all the firmware updates of that date. However I have also seen information which suggests the High Sierra installer might contain a set of the current firmware updates for supported models.
It then sets your Mac to install that firmware update which as past firmware updates requires shutting down your Mac completely, then pressing and holding down the power button until the firmware update process starts. It checks your Mac model and downloads the matching firmware updater. 
You download and run the High Sierra installer. I got the impression from some notes that the following takes place i believe your Mac will work fine with the OS it has on it for now, but I may be wrong I haven't found a way to get it to work at all, and until there's some kind of fix or word from Apple, I'm going to try installing it one more time then leave it for the time being. That it doesn't "take", or at least I haven't seen any evidence that it's doing anything, eg, grey screen with Apple icon on it and progress bar, and it's my understanding, limited though it is, that you must do this firmware update, eg there is no getting around it, and with High Sierra it'll be checking the firmware on a weekly basis. There's a certain procedure that the High Sierra asks you to do, to do a firmware update before installing High Sierra. You get the firmware update from Apple via the Internet, to the best of my understanding, you don't need a cd-rom with the firmware update on it-one doesn't exist (ah, if it were only that easy). 
Hi there, pdarrell, maybe i can help you.
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