Impossible to boot on Qubes 4.1.2

the file was called grubx64.cfg which I renamed to bootx64.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if loadfont unicode ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=fr_FR
  insmod gettext
fi
terminal_output gfxterm
insmod part_gpt
insmod ext2
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
else
  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
fi
insmod gfxmenu
loadfont ($root)/grub2/themes/qubes/unifont-bold-16.pf2
loadfont ($root)/grub2/themes/qubes/unifont-regular-14.pf2
loadfont ($root)/grub2/themes/qubes/unifont-regular-16.pf2
loadfont ($root)/grub2/themes/qubes/unifont-regular-32.pf2
insmod png
set theme=($root)/grub2/themes/qubes/theme.txt
export theme
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/01_fallback_counting ###
insmod increment
if [ -z "${boot_counter}" ]; then
  set boot_counter=0
elif [ "${boot_counter}" = "0" -o "${boot_counter}" = "-1" ]; then
  increment default
  set boot_counter=-1
else
  decrement boot_counter
fi
save_env boot_counter
### END /etc/grub.d/01_fallback_counting ###

### BEGIN /etc/grub.d/01_menu_auto_hide ###
if [ "${boot_success}" = "1" -o "${boot_indeterminate}" = "1" ]; then
  set last_boot_ok=1
else
  set last_boot_ok=0
fi

# Reset boot_indeterminate after a successful boot
if [ "${boot_success}" = "1" ] ; then
  set boot_indeterminate=0
  save_env boot_indeterminate
# Avoid boot_indeterminate causing the menu to be hidden more then once
elif [ "${boot_indeterminate}" = "1" ]; then
  set boot_indeterminate=2
  save_env boot_indeterminate
fi
set boot_success=0
save_env boot_success

if [ x$feature_timeout_style = xy ] ; then
  if [ "${menu_show_once}" ]; then
    unset menu_show_once
    save_env menu_show_once
    set timeout_style=menu
    unset timeout
  elif [ "${menu_auto_hide}" -a "${last_boot_ok}" = "1" ]; then
    set orig_timeout_style=${timeout_style}
    set orig_timeout=${timeout}
    if [ "${fastboot}" = "1" ]; then
      # timeout_style=menu + timeout=0 avoids the countdown code keypress check
      set timeout_style=menu
      set timeout=0
    else
      set timeout_style=hidden
      set timeout=1
    fi
  fi
fi
### END /etc/grub.d/01_menu_auto_hide ###

### BEGIN /etc/grub.d/20_linux_xen ###
menuentry 'Qubes, with Xen hypervisor' --class qubes --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-simple-/dev/mapper/qubes_dom0-root' {
	insmod part_gpt
	insmod ext2
	set root='hd0,gpt2'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
	else
	  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
	fi
	echo	'Loading Xen 4.14.6 ...'
        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
            xen_rm_opts=
        else
            xen_rm_opts="no-real-mode edd=off"
        fi
	multiboot2	/xen-4.14.6.gz placeholder  console=none dom0_mem=min:1024M dom0_mem=max:4096M ucode=scan smt=off gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096 ${xen_rm_opts}
	echo	'Loading Linux 6.1.43-1.qubes.fc32.x86_64 ...'
	module2	/vmlinuz-6.1.43-1.qubes.fc32.x86_64 placeholder root=/dev/mapper/qubes_dom0-root ro rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap plymouth.ignore-serial-consoles rd.driver.pre=btrfs rhgb quiet 
	echo	'Loading initial ramdisk ...'
	module2	--nounzip   /initramfs-6.1.43-1.qubes.fc32.x86_64.img
}
submenu 'Advanced options for Qubes (with Xen hypervisor)' $menuentry_id_option 'gnulinux-advanced-/dev/mapper/qubes_dom0-root' {
	submenu 'Xen hypervisor, version 4.14.6' $menuentry_id_option 'xen-hypervisor-4.14.6-/dev/mapper/qubes_dom0-root' {
		menuentry 'Qubes, with Xen 4.14.6 and Linux 6.1.43-1.qubes.fc32.x86_64' --class qubes --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-6.1.43-1.qubes.fc32.x86_64-advanced-/dev/mapper/qubes_dom0-root' {
			insmod part_gpt
			insmod ext2
			set root='hd0,gpt2'
			if [ x$feature_platform_search_hint = xy ]; then
			  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			else
			  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			fi
			echo	'Loading Xen 4.14.6 ...'
		        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
		            xen_rm_opts=
		        else
		            xen_rm_opts="no-real-mode edd=off"
		        fi
			multiboot2	/xen-4.14.6.gz placeholder  console=none dom0_mem=min:1024M dom0_mem=max:4096M ucode=scan smt=off gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096 ${xen_rm_opts}
			echo	'Loading Linux 6.1.43-1.qubes.fc32.x86_64 ...'
			module2	/vmlinuz-6.1.43-1.qubes.fc32.x86_64 placeholder root=/dev/mapper/qubes_dom0-root ro rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap plymouth.ignore-serial-consoles rd.driver.pre=btrfs rhgb quiet 
			echo	'Loading initial ramdisk ...'
			module2	--nounzip   /initramfs-6.1.43-1.qubes.fc32.x86_64.img
		}
		menuentry 'Qubes, with Xen 4.14.6 and Linux 5.15.94-1.qubes.fc32.x86_64' --class qubes --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-5.15.94-1.qubes.fc32.x86_64-advanced-/dev/mapper/qubes_dom0-root' {
			insmod part_gpt
			insmod ext2
			set root='hd0,gpt2'
			if [ x$feature_platform_search_hint = xy ]; then
			  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			else
			  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			fi
			echo	'Loading Xen 4.14.6 ...'
		        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
		            xen_rm_opts=
		        else
		            xen_rm_opts="no-real-mode edd=off"
		        fi
			multiboot2	/xen-4.14.6.gz placeholder  console=none dom0_mem=min:1024M dom0_mem=max:4096M ucode=scan smt=off gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096 ${xen_rm_opts}
			echo	'Loading Linux 5.15.94-1.qubes.fc32.x86_64 ...'
			module2	/vmlinuz-5.15.94-1.qubes.fc32.x86_64 placeholder root=/dev/mapper/qubes_dom0-root ro rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap plymouth.ignore-serial-consoles rd.driver.pre=btrfs rhgb quiet 
			echo	'Loading initial ramdisk ...'
			module2	--nounzip   /initramfs-5.15.94-1.qubes.fc32.x86_64.img
		}
	}
	submenu 'Xen hypervisor, version 4.14.6.config' $menuentry_id_option 'xen-hypervisor-4.14.6.config-/dev/mapper/qubes_dom0-root' {
		menuentry 'Qubes, with Xen 4.14.6.config and Linux 6.1.43-1.qubes.fc32.x86_64' --class qubes --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-6.1.43-1.qubes.fc32.x86_64-advanced-/dev/mapper/qubes_dom0-root' {
			insmod part_gpt
			insmod ext2
			set root='hd0,gpt2'
			if [ x$feature_platform_search_hint = xy ]; then
			  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			else
			  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			fi
			echo	'Loading Xen 4.14.6.config ...'
		        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
		            xen_rm_opts=
		        else
		            xen_rm_opts="no-real-mode edd=off"
		        fi
			multiboot	/xen-4.14.6.config placeholder  console=none dom0_mem=min:1024M dom0_mem=max:4096M ucode=scan smt=off gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096 ${xen_rm_opts}
			echo	'Loading Linux 6.1.43-1.qubes.fc32.x86_64 ...'
			module	/vmlinuz-6.1.43-1.qubes.fc32.x86_64 placeholder root=/dev/mapper/qubes_dom0-root ro rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap plymouth.ignore-serial-consoles rd.driver.pre=btrfs rhgb quiet 
			echo	'Loading initial ramdisk ...'
			module	--nounzip   /initramfs-6.1.43-1.qubes.fc32.x86_64.img
		}
		menuentry 'Qubes, with Xen 4.14.6.config and Linux 5.15.94-1.qubes.fc32.x86_64' --class qubes --class gnu-linux --class gnu --class os --class xen $menuentry_id_option 'xen-gnulinux-5.15.94-1.qubes.fc32.x86_64-advanced-/dev/mapper/qubes_dom0-root' {
			insmod part_gpt
			insmod ext2
			set root='hd0,gpt2'
			if [ x$feature_platform_search_hint = xy ]; then
			  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			else
			  search --no-floppy --fs-uuid --set=root 4cf1ce08-ceeb-49eb-bae4-f2e5c2bb4d89
			fi
			echo	'Loading Xen 4.14.6.config ...'
		        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" ]; then
		            xen_rm_opts=
		        else
		            xen_rm_opts="no-real-mode edd=off"
		        fi
			multiboot	/xen-4.14.6.config placeholder  console=none dom0_mem=min:1024M dom0_mem=max:4096M ucode=scan smt=off gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096 ${xen_rm_opts}
			echo	'Loading Linux 5.15.94-1.qubes.fc32.x86_64 ...'
			module	/vmlinuz-5.15.94-1.qubes.fc32.x86_64 placeholder root=/dev/mapper/qubes_dom0-root ro rd.lvm.lv=qubes_dom0/root rd.lvm.lv=qubes_dom0/swap plymouth.ignore-serial-consoles rd.driver.pre=btrfs rhgb quiet 
			echo	'Loading initial ramdisk ...'
			module	--nounzip   /initramfs-5.15.94-1.qubes.fc32.x86_64.img
		}
	}
}

### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###