/bin/busybox mount -o ro /dev/main/root /mnt/root || rescue_shell
# Unmount filesystems
-/bin/busybox unmount /dev
+/bin/busybox umount /dev || rescue_shell
# Boot system
-exec switch_root /mnt/root /sbin/init
+exec /bin/busybox switch_root /mnt/root /sbin/init || rescue_shell