diff --git a/scripts/fix-grub-live.sh b/scripts/fix-grub-live.sh
new file mode 100644
index 0000000..a75a812
--- /dev/null
+++ b/scripts/fix-grub-live.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+# Reparer GRUB depuis une cle USB live
+# Usage: sudo bash fix-grub-live.sh
+set -e
+
+DISK=""
+for d in /dev/sda /dev/nvme0n1 /dev/sdb /dev/vda; do
+  if [ -b "$d" ] && [ "$(cat /sys/block/$(basename $d)/removable 2>/dev/null)" = "0" ]; then
+    DISK="$d"
+    break
+  fi
+done
+[ -n "$1" ] && DISK="$1"
+[ -z "$DISK" ] && { echo "Aucun disque detecte. Usage: $0 /dev/sdX"; exit 1; }
+
+if [[ "$DISK" == *"nvme"* ]]; then
+  P="${DISK}p"
+else
+  P="${DISK}"
+fi
+
+echo "=== Reparation GRUB sur $DISK ==="
+
+# Monter
+mount "${P}2" /mnt
+mount "${P}1" /mnt/boot/efi
+for d in dev dev/pts proc sys run; do mount --bind /$d /mnt/$d; done
+
+# Installer git + fonts, cloner le repo, installer theme + GRUB
+chroot /mnt bash -c '
+  apt update -qq
+  apt install -y -qq git grub-efi-amd64 fonts-dejavu-core
+  [ -d /home/jules/photobooth ] || git clone https://git.copydev.fr/jules/photobooth.git /home/jules/photobooth
+  cd /home/jules/photobooth && git pull
+  bash scripts/install-grub-theme.sh
+  grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=debian --recheck
+'
+
+# Nettoyer
+umount -R /mnt
+
+echo ""
+echo "=== GRUB repare ! Retirer la cle et rebooter ==="