Hello guys ! This is another thread about a problem Luma 8.0, and before posting I litterally searched and tried everything on gbatemp.. So I did a DSIWare Downgrade ( o3ds xl source => to o3ds ) and everything went perfect. I unlink NNID on the source and the target and I created a new one for both of the consoles. Both consoles can acces e-shop, both are unbanned, both can play online, and I even do a TinyFormat to create a new friend code so ( I think ) the console should not have the same identity ( like I said, I think.. ) But STILL both the console ( even if they are marked friends between them ) can't play locally together ( at some games only ) for a unknow reason. No error code, no information, just " An error as occured". Tried on Metroid Federation Force, Kid Icarus Uprising, Monster Hunter Generations, ect.. But works on DK Country Returns 3D, Animal Crossing, Triforce Heroes.. I don't exactly understand why and how to solve it. I thought it was maybe because of the origin and the region of the CIA. But games are provided by freeshop ( so directly by the Nintendo Servers right ? ) and I checked on FBI and all the titles are EUR like the console region too by the way. Soooo I'm at a dead point.. If somebody could help me that would be very king, thank you !