I can't boot current in UEFI on "recent: Prime H310M-C CR2.0 motherboard.
Here on Ubuntu, I see the CD have: /media/paul/Debian sid h-i386 1/EFI/boot/bootia32.efi nothing else in that /EFI/boot directory. I am really unsure, but I feel this file is for people having to boot 32 bits (U)EFI. Most people have 64 bits (U)EFI. Searcing confirmation: https://wiki.debian.org/UEFI leads to think to use bootia32.efi >From >https://www.congatec.com/fileadmin/user_upload/Documents/Application_Notes/AN31_Creating_a_UEFI_Stick.pdf Section 2.2 I tend to think this is linked to the UEFI PC... I think if your PC is 64 bits and you want to run 32 bit OS you need: BOOTX64.efi But like said, better have the two to work on both.