chroot "$@" apt-get --yes install ${PACKAGES}
chroot "$@" apt-get --yes --auto-remove purge
chroot "$@" apt-get --yes --auto-remove upgrade
- chroot "$@" rpi-update
+ chroot "$@" rpi-update || [ -f "$@/boot/bootcode.bin" ]
sync
chroot "$@" apt-get clean
chroot "$@" rm /usr/local/sbin/invoke-rc.d