Yes, since an update to the firmware that came out shortly after the cart was first released, it has shown an icon for the eWin in the menu but there has never been any actual support for the eWin. You can download a loader program from the DSTT website, but GBA ExpLoader is a lot better (and supports the EZFlash 3-in-1).
There are some advantages of the eWin 2-in-1 over the EZFlash 3-in-1, and some disadvantages as well. Both work fine for GBA games and the Opera browser. The eWin has more fast volatile memory while the EZFlash has an additional non-volatile but slow NOR memory (which you have to use for larger games due to its smaller volatile memory) plus a crappy rumble.
-Bri