As I have
mentioned elsewhere, I cannot play Smas Bros or Link Between Worlds retail carts on my downgraded system - both appear to have 6+ encryption.
I eventually restored my sysNAND to 9.2 and my retail carts worked again. After installing savedatafiler it became obvious that I couldn't use that to decrypt saves because it won't work in classic mode.
As the link above suggests, I found mention on MaxConsole forums of someone working on a decryption program, but no link.
What are the options for solving this problem? At the moment I am happy to stay on 9.2 to keep my saves, but if I could transfer and downgrade I would.
Lastly, we should make a list of retail games that do this. I add the two above to the list.