dd if=Fedora-Server-netinst-i386-23.iso bs=512 count=1 of=/tmp/f23.mbr
mount -o loop Fedora-Server-netinst-i386-23.iso /mnt
cd /mnt
xorriso -as mkisofs -o /tmp/f23.iso -b /isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -isohybrid-mbr /tmp/f23.mbr -partition_offset 16 .