I have found the solution here:
https://felsoci.sk/blog/facing-issues-while-installing-guix.html

It's a blog post from Marek Felsoci. I followed the instruction from the
section "No bootable devices found":

In the "EFI/" directory of the boot partition, I created a "boot" directory
next to the "Guix" directory. Then, I copy the file
"EFI/Guix/grubx64.efi" to "EFI/boot/bootx64.efi". Now, I can reboot and
it work.

I checked on another installation of Fedora and it create a "EFI/BOOT/"
directory on the boot partition. This directory contains 4 files:
"BOOTIA32.EFI", "BOOTX64.EFI", "fbia32.efi" and "fbx64.efi". The blog
post tell that Ubuntu and Windows do the same.

I think it would be better if Guix System install a copy of the Grub EFI
file as "EFI/boot/bootx64.efi" or "EFI/BOOT/BOOTX64.efi" like Fedora,
Ubuntu and Windows do. It would permit Guix System to boot on bad EFI
implementation.

I will open a bug report soon about this.

Thank you Rutherther for helping me on this problem, and Marek Felsoci
for your blog post.


Best regards

-------
Gendre Sébastien

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