Brand new, we haven't looked at reversing the menu yet. The mapper is the same as our 256Mbyte GBA cart so the menu should be compatible too.
The benefit of this cart is, it has battery saves so no need to batteryless patch your roms for them to save, plus enough room for 7 or more games on one cart.
More info to come -
The cart appears to contain 64mbytes of Flash - 16 of which is consumed by the menu. You can fit 3 full 16mbyte rom's on this cart, 6 8mbyte roms, or dozens of GBC/NES Rom's.