This challenge's flag is sealed in a high-security flag vault protected
by an atmega32u4 micro-controller.

The only way to unlock it is to enter the correct pin '13371337' into
the physical access-control panel at the conference. There's just one problem..
the button for entering the '3' digit recently broke!

Surely a talented hacker such as yourself can find another way in.

To help you out a little, I even managed to get my hands on the
source code from the manufacturer.