Hey there,

I tried the trick you told me with the elilo.conf file and the bootx64.efi in the /efi/boot directory!.

I succeed finally to boot on the usb key in UEFI only mode:

It was written :
Elilo boot:
Then it loads 2 files, and writes "done" for each of them. Then it stops loading and the usb key turn off. The screen stays the same....

What 's the matter ?

Thank you !