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The problem I have is on a secure boot system my PE boots fine but it bypasses the grub options I've added, like bootable imaging apps and some other images for diagnostics.
- After bootx64.efi loads, what happens, and which of the other files are needed (specifically for USB boot only?) Let's use an enUS standard ADK PE as an example:
bootmgr.efi (why is this there, when UEFI is looking in EFI\Boot ?)
EFI\Boot\en-us\bootx64.efi.mui (is this optional, or only needed when using a different language?)
EFI\Microsoft\Boot\Fonts\malgun_boot.ttf (and other fonts, are they optional/ when are they used?)
EFI\Microsoft\Boot\BCD (why is it in de \Microsoft folder, not in plain \EFI folder?)
EFI\Microsoft\Boot\Resources\bootres.dll (another confusing file, what does it do and why does it seem to be optional)?
The Acronis issue sounds like a driver signing problem indeed. Easiest way of course is to replace the standard BCD with the modified one from SE.
I will have to cross that bridge when I have UEFI hardware to test, it could even be an ASUS-specific thing, who knows...