I would like to decrypt my Smash 4 and Kid Icarus Uprising retail cartridge saves, which use the new save crypto introduced in firmware 6.x, and then I would like to reencrypt them using the older save crypto used in firmware 4.x so I can downgrade my firmware and use the Gateway exploit offline and retain my retail game saves that use newer encryption. Is this at all possible? Or are there any workarounds that I can use to keep and play my saves with my retail cartridges after downgrading to 4.x?