Hi there!
Since the search only pointed to this topic and I couldn't reply to it, I'm creating a new one.
What's new on the front? 10 years later and I've run into a similar problem.
I'm trying to rebuild/remaster the k3os-amd64.iso
I've copied the contents of the ISO into folder "x:\k3os-amd64"
tried extracting with 7-zip, as well as mounting via Windows and copying from the virtual drive
edited some files unrelated to grub or boot
started up ImgBurn
selected "Create image file from files/folders"
added folder "x:\k3os-amd64\" via "Browse for a folder..."
switched to the tab "Advanced/Bootable Disc"
activated "Make Image Bootable"
selected Boot Image "x:\k3os-amd64\boot\grub\i386-pc\eltorito.img"
switched Platform ID to "UEFI"
checked "Patch Boot Information Table"
clicked "Build"
The resulting ISO file wouldn't let my k3os vm boot, while the original, unmodified k3os-amd64.iso works without problems.
Are there any options I'm missing, am I using it wrong or won't this ever get fixed?
Thanks a lot for ImgBurn and in advance for any help.