@Matthieu-Jacquart Hmmm, looks interesting. But as George already said this seams to throw up even more questions. Please take a look at the apache error and access logs to see what happened at that point.
And there are more typos which probably don’t cause an issue at this stage yet but might later on: “rw” instead of “rz”, missing ‘/’ in “init=/sbin/init” and “root=/dev/ram0”.
Can you please post the ouput of the following commands on your FOG server:
ls -al /var/www/fog/service/ipxe/bzImage
ls -al /var/www/fog/service/ipxe/init.xz
Just want to see if the filesizes match and what version that kernel is.