SIW2 said:
It is bcdbootdiskv24 now.
A separate program from bcdboot? I did a search on bcdbootdiskv24 but that turned up nothing.

Can your os/winpe run pecmd scripts or do you need an executable ?
Uh, pecmd is beyond my pay grade. I guess I would need an executable.

os letter needs to be set after applying the image and before the setup phase.

If using windows setup.exe instead of booting straight into the applied os need to boot into a different os or winpe, set the letter, and then boot into the os.

Or if using the apply method, first apply the image then set the os letter then run bcdboot before booting into the newly applied os.
I guess I will be able to understand this once I've tried out this program.