So I've been trying to do this for a long time now. I've done two methods and neither of them work. Right now, I'm looking at this one; https://gbatemp.net/threads/tutorial-give-your-mii-gold-pants-and-use-it-for-streetpass.379146/ . My problem is when I open the extdata_dump via OOTHax, it tells me that the copying failed and nothing happens. Does anyone know what I'm doing wrong? I'm using Firmware 11.0.