install iso with loop / dd

dd if=/usr/lib/syslinux-legacy/mbr.bin of=${DEVICE}

syslinux ${DEVICE}1

mkdir -p /media/$(basename ${DEVICE})1
mount -t vfat ${DEVICE}1 /media/$(basename ${DEVICE})1
mount -t udf,iso9660 alpine-2.5.4-x86.iso  loop -o loop,norock
cd loop
cp -a .alpine-release * /media/$(basename ${DEVICE})1
cd ..
umount loop
umount ${DEVICE}1