Sorry for being unresponsive - back in the office today after a week of unexpected child-minding at home. I’ll respond properly once I’ve had my second coffee, but I appreciate all the effort which has gone in while I’ve been offline.
Thank you for taking the trouble to check those images; it’s reassuring to know that a second instance of FIT rejects them too.
That really is extremely kind of you; I’ve downloaded that image and it opens in FIT. Furthermore, if I flash it to the machine which previously had AMT disabled, the option to enable it appears in the BIOS and I’m able to provision, which was the goal.
I have another fifty machines to do, so I need to investigate how to repeat your work of overwriting the EFS partition.
Thank you for showing me the way forward!