Could not patch WIM?

[NiKiZe]

"no embedded bootmgr.exe found"
"FATAL: no bootmgr.exe"
That is a totally different issue from what this original thread was about.

wimboot has nothing to do with creating any ISO, also you should not have any ISO at all when using wimboot, so I'm a bit confused about what you mean here.

If you find the correct "extracted" bootmgr.exe you can add that as an extra initrd line, however it is probably a better idea to figure out why the boot.wim seems to be incorrectly created and by what. I have read about this issue before (no bootmgr.exe where it is expected to be in the .wim), but that might have been on IRC so can't find relevant links for it.