As you mentioned NTFS and FAT, be aware that all EFIs support FAT boot media, but I have yet to encounter one that supports NTFS. In both cases, the solution usually involves creating the boot medium with another tool, although sometimes adjusting options in the tool you're using may do the trick. This can be because there's something odd about the boot medium that's fine with some computers but not with others or because of a bug in the firmware. Quirky incompatibilities - Sometimes a boot medium works fine on one computer but not on another.See my notes on a few programs for more details. Others require that particular options be set before they'll create EFI-bootable media. This is true of Pen Drive Linux (aka YUMI and one or two other names), for instance. iso files omit the EFI-mode boot loader entirely, or put the EFI boot loader in a non-standard location. No EFI boot files - Some programs for creating bootable USB media from Ubuntu's.The symptoms you describe are consistent with this not being the case. To boot in EFI mode, an external boot medium needs to have an EFI-mode boot loader ( EFI/BOOT/boot圆4.efi) on a filesystem that the firmware can read.

Universal boot installer