13 years.
The original DS was released in 2004, and to this day, no hax for Download Play had been made.
Until now.
Gericom found an exploit in DS Download Station, allowing us to run any homebrew we'd like over DS download play.
Source code for dspatch: https://github.com/Gericom/dspatch
Enjoy!
Credits:
Exploit: shutterbug2000, Gericom, and Apache Thunder
Graphics: Jaames, Robz8
And if you want to load unsupported flashcarts on a DSi:...
HaxxStation: DS Download Station exploit