Hacking EZ IV on a DSlite

[santakuroosu]

I have an old EZ IV card and I just bought a DSlite (I'm not buying a DSi and paying for stuff I don't need), but when I powered up it started in GBA mode.
I've been searching around and I can't seem to find a way to make it boot in DS mode.
Anyone got some insight on this?

Edit: Owait. Do I need to flash it? It's been so long I don't remember anymore.