DIY High-Altitude Ballooning
This sounds like fun. I saw an article about something similar in Scientific American a few years ago, but this is the first time I've heard of flight code being changed so close to the wire.
The code they had was not really "flight" code - the code did not control flight in any way - it was just a sealed baloon that went up and popped. The code was just controlling when to turn GPS / radio and camera on and off. In the end they wrote code to run it for 2 hours, then turn it off. Not exactly the most complicated code on the planet.