@szeraax Thanks for the update. It’s definitely an issue that we will be seeing more and more in the next month.
Not because it is solved, but because I will just have to wait for a magical time in the future when FOG has support for booting NVMe hard drives decently.
Unfortunately those things rarely solve themselves magically. People have to work on it. In this case having the hardware at hand seems to be very crucial as your findings reveal (same zbook model showing different behavior). By the way, have you checked firmware versions?
So what I am trying to say is that it might need your work on testing these things on your devices to hopefully figure things out. But on the other hand I do understand that you/we don’t have the time and expertise to dig through this.
Maybe try going back to using rEFInd plus adding the clover NVMe driver? As I understand it you should be able to add that driver by simply creating a directory drivers_x64 (EFI/boot/drivers_x64) and putting that clover driver EFI file there. rEFInd should scan that directory and load the driver.
Not sure if we’d mark this solved.