On 07/10/2021 14:52, Dean Westhead wrote:
Sorry ... I didnt want to take lots of your time if it is only me having this 
issue and everyone else is working fine.

In the old "working" ISO, there is the following files :

boot.cat
efiboot.img
ipxe.krn
isolinux.bin
isolinux.cfg

The new one that isnt seen as a EFI bootable disk has :

boot.catalog
esp.img
ipxe.lkrn
isolinux.big
isolinux.cfg

I will open the EFI image too and see what is in that as soon as i can and let 
you know about that too.

Thanks! Most of those files are for BIOS booting: the relevant ones for UEFI are efiboot.img/esp.img, which should both be FAT filesystem images containing a file \EFI\Boot\BootX64.efi (which should be the ipxe.efi binary).

Michael

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