Unhackable : “Not hackable; that cannot
be hacked or broken into.” We manage
updates and thus have fixes, this is not a
PS3 as it is unhackable … or is it? Score
200 Link http://
updator.challs.nuitduhack.com/

Original writeup (http://geeksspeak.github.io/blog/2015/04/05/ndh-ctf-2015-updator-writeup/).