I just deleted Advance Wars in-app with the intent of deleting the save data too, because, you know, challenge runs. When I redownloaded the ROM, it picked up right where I left off; save data had not been deleted. Double checked issue with other ROMs. Same thing occurred. One caveat: when you redownload the ROM, it must be named exactly the same thing as it was before for this issue to be replicated.
I just deleted Advance Wars in-app with the intent of deleting the save data too, because, you know, challenge runs. When I redownloaded the ROM, it picked up right where I left off; save data had not been deleted. Double checked issue with other ROMs. Same thing occurred. One caveat: when you redownload the ROM, it must be named exactly the same thing as it was before for this issue to be replicated.
Workaround: Delete the save data via iTunes.